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