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