285 (number)
| ||||
|---|---|---|---|---|
| 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 | |||
| Senary | 11536 | |||
| Octal | 4358 | |||
| Duodecimal | 1B912 | |||
| Hexadecimal | 11D16 | |||
285 is the natural number following 284 and preceding 286.
In mathematics
[edit]- 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
[edit]- 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
[edit]- 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 Cereser, 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
[edit]- 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
[edit]- ^ "Composite numbers". mathworld.wolfram.com.
- ^ "Square pyramidal number sequence". marhworld.wolfram.com.
- ^ "Binary rooted tree". mathworld.wolfram.com.
- ^ "Sphenic numbers". mathworld.wolfram.com.
- ^ "Harshad numbers". mathworld.wolfram.com.
- ^ "Repdigit numbers". mathworld.wolfram.com.
- ^ Sloane, N. J. A. (ed.). "Sequence A053701 (Vertically symmetric numbers)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ^ "Turbojet 285 Williams Jet Tenders motorboat". www.williamsjettenders.com.
- ^ "Area code 285". www.areacodehelp.com.
- ^ "Guinness World Record 285 crossovers whil jumping rope". www.guinnessworldrecords.com.
- ^ "Cork popping relay record". www.guinnessworldrecords.com.
- ^ "285 people in a video toast chain". www.guinnessworldrecords.com.
- ^ "French Republican Calendar Guide" (PDF). broadcast.lds.org.
- ^ "285 Regina". in-the-sky.org.
- ^ "285th Civil Engineering Squadron". vi.ng.mil.
- ^ "Interstate 285 is the most dangerous highway in the United States". www.schollelaw.com. 27 September 2021.