255816 has 96 divisors (see below), whose sum is σ = 842400. Its totient is φ = 69120.

The previous prime is 255803. The next prime is 255839. The reversal of 255816 is 618552.

255816 = 43³ + 44³ + 45³.

It is a self number, because there is not a number n which added to its sum of digits gives 255816.

It is an unprimeable number.

255816 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13455 + ... + 13473.

It is an arithmetic number, because the mean of its divisors is an integer number (8775).

2²⁵⁵⁸¹⁶ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 255816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (421200).

255816 is an abundant number, since it is smaller than the sum of its proper divisors (586584).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

255816 is a wasteful number, since it uses less digits than its factorization.

255816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59 (or 52 counting only the distinct ones).

The product of its digits is 2400, while the sum is 27.

The square root of 255816 is about 505.7825619770. The cubic root of 255816 is about 63.4808258392.

The spelling of 255816 in words is "two hundred fifty-five thousand, eight hundred sixteen".