284 (number)

← 283 284 285 →
← 200 210 220 230 240 250 260 270 280 290 → List of numbers Integers ← 0 100 200 300 400 500 600 700 800 900 →
Cardinal	two hundred eighty-four
Ordinal	284th (two hundred eighty-fourth)
Factorization	22 × 71
Divisors	1, 2, 4, 71, 142, 284
Greek numeral	ΣΠΔ´
Roman numeral	CCLXXXIV
Binary	1000111002
Ternary	1011123
Senary	11526
Octal	4348
Duodecimal	1B812
Hexadecimal	11C16

284 is the natural number following 283 and preceding 285.

In mathematics

• 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]

World Records

• 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]

Other fields

• 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]

References

1. "Composite numbers". mathworld.wolfram.com.
2. "Amicable numbers". mathworld.wolfram.com.
3. Sloane, N. J. A. (ed.). "SequenceA004215(Numbers that are the sum of 4 but no fewer nonzero squares)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.
4. Sloane, N. J. A. (ed.). "SequenceA005277". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.
5. Sloane, N. J. A. (ed.). "SequenceA014688". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.
6. "284 world records in Picross". www.guinnessworldrecords.com.
7. "284 people in a rhythmic yoga lesson". www.guinnessworldrecords.com.
8. "283 weapons in a fighting video game". www.guinnessworldrecords.com.
9. "284 people attending a hand-drumming relay". www.guinnessworldrecords.com.
10. "284 Amalia asteroid information". www.universeguide.com. 27 March 2019.