287 (number)
From HandWiki
Short description: Natural number
| ||||
|---|---|---|---|---|
| Cardinal | two hundred eighty-seven | |||
| Ordinal | 287th (two hundred eighty-seventh) | |||
| Factorization | 7 × 41 | |||
| Divisors | 1, 7, 41, 287 | |||
| Greek numeral | ΣΠΖ´ | |||
| Roman numeral | CCLXXXVII | |||
| Binary | 1000111112 | |||
| Ternary | 1011223 | |||
| Quaternary | 101334 | |||
| Quinary | 21225 | |||
| Senary | 11556 | |||
| Octal | 4378 | |||
| Duodecimal | 1BB12 | |||
| Hexadecimal | 11F16 | |||
| Vigesimal | E720 | |||
| Base 36 | 7Z36 | |||
287 is the natural number following 286 and preceding 288.
In mathematics
- 287 is an odd composite number with 2 prime factors.[1]
- 287 is the sum of consecutive primes in three different ways, 89+97+101, 43+53+59+61+67, and 17+19+23+29+31+37+41+43+47
- 287 is a pentagonal number which follows the concept of triangular numbers.[2]
- 287 is an odd semiprime number.[3]
- 287 is the sum of exactly 4 nonzero squares.[4]
- 287 is a number where 2(287)-1 and 2(287)+1 are both prime.[5]
World Records
- On November 15, 2012, in the United Kingdom , the largest toy construction lesson was achieved with 287 participants.[6]
- On August 8, 2018, in Japan , the largest blind soccer (football) lesson was completed with 287 members.[7]
- On February 28, 2020, the largest Welsh folk dance was completed in Swansea in the United Kingdom . There were 287 participants.[8]
- On June 20, 2009, Bora Milutinović completed the Guinness World Record for the greatest number of international soccer matches a coach has been in charge of. He was at 287 games.[9]
- On December 20, 2020, the largest group of people dressed as the sun was completed in Guangzhou, China. There were 287 participants.[10]
Other fields
- The calendar years 287 AD and 287 BC.
- 287 is the number of several highways in Brazil , Canada , Japan , and the United States .
- 287 Nephthys is an S-type asteroid in the asteroid belt. It was discovered by Christian Heinrich Friedrich Peters in Clinton, Oneida County, New York. It was named after Nephthys in Egyptian mythology.[11]
References
- ↑ "Composite numbers". https://mathworld.wolfram.com/CompositeNumber.html.
- ↑ "Pentagonal number". https://mathworld.wolfram.com/PentagonalNumber.html.
- ↑ Sloane, N. J. A., ed. "Sequence A046315 (Odd semiprimes: odd numbers divisible by exactly 2 primes (counted with multiplicity))". OEIS Foundation. https://oeis.org/A046315.
- ↑ Sloane, N. J. A., ed. "Sequence A004215 (Numbers that are the sum of 4 but no fewer nonzero squares)". OEIS Foundation. https://oeis.org/A004215.
- ↑ Sloane, N. J. A., ed. "Sequence A002822 (Numbers m such that 6m-1, 6m+1 are twin primes)". OEIS Foundation. https://oeis.org/A002822.
- ↑ "287 people at a toy making lesson". https://www.guinnessworldrecords.com/world-records/105302-largest-toy-construction-lesson-multiple-venues.
- ↑ "287 person blind soccer lesson". https://www.guinnessworldrecords.com/world-records/526192-largest-blind-football-soccer-lesson.
- ↑ "287 people in a Welsh folk dance". https://www.guinnessworldrecords.com/world-records/369231-largest-welsh-folk-dance.
- ↑ "287 international soccer games by a single coach". https://www.guinnessworldrecords.com/world-records/383072-most-international-football-soccer-matches-managed-by-a-coach.
- ↑ "287 people dressed as the sun". https://www.guinnessworldrecords.com/world-records/611814-largest-gathering-of-people-dressed-as-the-sun.
- ↑ "287 Nephthys information". https://in-the-sky.org/data/object.php?id=A287.
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