284 is the natural number following 283 and preceding 285.

• 284 is an even composite number with 2 prime factors.^[1]
• 284 is in the first pair of amicable numbers with 220. That means that the sum of the proper divisors are the same between the two numbers.^[2]
• 284 can be written as a sum of exactly 4 nonzero perfect squares.^[3]
• 284 is a nontotient number which are numbers where phi(x) equaling that number has no solution.^[4]
• 284 is a number that is the nth prime plus n. It is the 51st prime number (233) plus 51.^[5]

• On July 3, 2010, Eduaedo Nakagawa achieved the Guinness World Record as the most prolific holder of records on Picross. He has the record for 284 of the 345 levels.^[6]
• On June 21, 2019, the largest rhythmic yoga lesson was completed in Hefei, China. It had 284 attendees.^[7]
• On October 25, 2005, Soulcalibur III was released on the PlayStation 2 with the most weapons in any video game. It had 284 weapons.^[8]
• On October 17, 2022, the students of Tabla Talim Sanstha in Ahmedabad, India completed the longest hand-drumming relay with 284 people.^[9]

• The calendar years 284 AD and 284 BC.
• 283 is the number of several highways in Japan and the United States.
• 284 Amalia is an asteroid in the asteroid belt. It was discovered by Auguste Charlois in Nice, France and is a Ch-type asteroid.^[10]