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 and eighty-fourth)
Factorization	2^2× 71
Roman numeral	CCLXXXIV
Binary	1000111002
Ternary	1011123
Quaternary	101304
Quinary	21145
Senary	11526
Octal	4348
Duodecimal	1B812
Hexadecimal	11C16
Vigesimal	E420
Base 36	7W36

Two hundred eighty-four (284, CCLXXXIV) is the natural number following 283 and preceding 285.

Its divisors are 1, 2, 4, 71, and 142, adding up to 220, in turn, the divisors of 220 add up to 284, making the two a pair of amicable numbers.^[1]

284 equals the sum of the squares of the digits of its own square in base 15. This property is shared with 1, 159, 264, 306 and 387.

There is no answer to the equation φ(x) = 284, making 284 a nontotient.

In other fields

See also the year 284 and List of highways numbered 284.

References

1. Higgins, Peter (2008). Number Story: From Counting to Cryptography. New York: Copernicus. p. 61. ISBN 978-1-84800-000-1.