287 (number)

287 is the natural number following 286 and preceding 288.

• 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]

• 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]

• 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]