285 (number)

Short description: Natural number

| <- 284  | 285 |  286 ->

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← 200 210 220 230 240 250 260 270 280 290 →

List of numbers — Integers

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Cardinal| two hundred eighty-five
Ordinal| 285th
(two hundred eighty-fifth)
Factorization| 3 × 5 × 19
Divisors| 1, 3, 5, 15, 19, 57, 95, 285
Greek numeral| ΣΠΕ´
Roman numeral| CCLXXXV
Binary| 1000111012
Ternary| 1011203
Quaternary| 101314
Quinary| 21205
Senary| 11536
Octal| 4358
Duodecimal| 1B912
Hexadecimal| 11D16
Vigesimal| E520
Base 36| 7X36

285 is the natural number following 284 and preceding 286.

## Contents

* 1 In mathematics
* 2 In technology
* 3 World Records
* 4 Other fields
* 5 References

## In mathematics

* 285 is an odd composite number.[1]
* 285 is the 9th square pyramidal number. That means it is the sum of a number of consecutive perfect squares starting with 1. For 285, it is the sum of all of the single digits' perfect squares.[2]
* 285 is the number of variations possible with a binary rooted tree with 13 points. A binary rooted tree means that it always begins with 1 point that is rooted. From there, each point can branch in up to two directions.[3]
* 285 is a sphenic number which means that it has three prime factors.[4]
* 285 is a Harshad number. That means that it is divisible by the sum of its digits. 285 is divisible by 15.[5]
* 285 is a repdigit number in base 7. In base 7, 285 is 555.[6]
* 285 is a very symmetric number. If flipped horizontally, these numbers are symmetrical.[7]

## In technology

* The Turbojet 285 is a variation of the Williams Jet Tenders motorboat that is smaller than its other designs. It is designed for personal use.[8]
* In North America, the area code 285 does not exist. If you are receiving a call from a number that begins with 285, it is likely a spam call.[9]

## World Records

* On December 9, 2022, Peter Thomson received the Guinness World Record for the greatest number of crossovers while jumping rope in a row.[10]
* On October 7, 2015, Camelot UK Lotteries Limited achieved the Guinness World Record for the longest champagne cork popping relay.[11]
* The Guinness World Record for the greatest number of people in an online video toast chain as of December 16, 2022, is 285. It was achieved in Brazil .[12]
* On April 12, 2018, the Narraghmore Vintage Club received the Guinness World Record for having the largest parade of 285 tractors

## Other fields

* The calendar years 285 AD and 285 BC.
* In the French Republican calendar, The year 285 would be a year 9 cycle and be in 2077.[13]
* 285 Regina is a Main belt asteroid that was discovered in 1889 by Auguste Charlois in Nice, France.[14]
* In 1980 the 285th Civil Engineering Squadron in the United States Air Force . It is located on the US Virgin Islands.[15]
* 285 is the number for several highways in Brazil , Canada , Ireland, Japan , and the United States
* Interstate Highway 285 in Georgia is listed as one of the most dangerous highways in the United States with 3.5 deaths per 10 miles per year.[16]

## References

1. ↑ "Composite numbers". https://mathworld.wolfram.com/CompositeNumber.html.
2. ↑ "Square pyramidal number sequence". https://mathworld.wolfram.com/SquarePyramidalNumber.html.
3. ↑ "Binary rooted tree". https://mathworld.wolfram.com/RootedTree.html.
4. ↑ "Sphenic numbers". https://mathworld.wolfram.com/SphenicNumber.html.
5. ↑ "Harshad numbers". https://mathworld.wolfram.com/HarshadNumber.html.
6. ↑ "Repdigit numbers". https://mathworld.wolfram.com/Repdigit.html.
7. ↑ Sloane, N. J. A., ed. "Sequence A053701 (Vertically symmetric numbers)". OEIS Foundation. https://oeis.org/A053701.
8. ↑ "Turbojet 285 Williams Jet Tenders motorboat". https://www.williamsjettenders.com/owners-centre/turbojet-285/.
9. ↑ "Area code 285". https://www.areacodehelp.com/where/area_code_285.shtml.
10. ↑ "Guinness World Record 285 crossovers whil jumping rope". https://www.guinnessworldrecords.com/world-records/547163-most-consecutive-double-under-crossovers-criss-cross-while-skipping.
11. ↑ "Cork popping relay record". https://www.guinnessworldrecords.com/world-records/391004-longest-champagne-cork-popping-relay.
12. ↑ "285 people in a video toast chain". https://www.guinnessworldrecords.com/world-records/115753-most-people-in-an-online-video-toast-chain.
13. ↑ "French Republican Calendar Guide". https://broadcast.lds.org/elearning/FHD/Community/en/FamilySearch/Handwriting/French/Lesson2/Handouts/French_Republican_Calendar.pdf.
14. ↑ "285 Regina". https://in-the-sky.org/data/object.php?id=A285.
15. ↑ "285th Civil Engineering Squadron". https://vi.ng.mil/VI-Air-Guard/285th-CES-ANG/.
16. ↑ "Interstate 285 is the most dangerous highway in the United States". https://www.schollelaw.com/auto-accidents/the-dangers-of-atlanta-i-285-accidents.

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