255564 has 36 divisors (see below), whose sum is σ = 669760. Its totient is φ = 82080.

The previous prime is 255551. The next prime is 255571. The reversal of 255564 is 465552.

255564 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1002 + ... + 1230.

2²⁵⁵⁵⁶⁴ 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 255564, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (334880).

255564 is an abundant number, since it is smaller than the sum of its proper divisors (414196).

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

255564 is a wasteful number, since it uses less digits than its factorization.

255564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270 (or 265 counting only the distinct ones).

The product of its digits is 6000, while the sum is 27.

The square root of 255564 is about 505.5333816871. The cubic root of 255564 is about 63.4599743628.

The spelling of 255564 in words is "two hundred fifty-five thousand, five hundred sixty-four".