284 (number)

284 (two hundred [and] eighty-four) is the natural number following 283 and preceding 285.

← 283 284 285 →
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Cardinal	two hundred eighty-four
Ordinal	284th (two hundred eighty-fourth)
Factorization	2^2 × 71
Divisors	1, 2, 4, 71, 142, 284
Greek numeral	ΣΠΔ´
Roman numeral	CCLXXXIV
Binary	1000111002
Ternary	1011123
Octal	4348
Duodecimal	1B812
Hexadecimal	11C16

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.