284 (number)
284 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.
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 = 284, making 284 a nontotient.See also the year 284 and List of highways numbered 284.
