255636864 has 128 divisors (see below), whose sum is σ = 862348800. Its totient is φ = 73032192.

The previous prime is 255636863. The next prime is 255636869. The reversal of 255636864 is 468636552.

255636864 is a `hidden beast` number, since 2 + 5 + 5 + 636 + 8 + 6 + 4 = 666.

255636864 is digitally balanced in base 2, 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 (128).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255636863) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18909 + ... + 29475.

It is an arithmetic number, because the mean of its divisors is an integer number (6737100).

Almost surely, 2^255636864 is an apocalyptic number.

255636864 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 255636864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (431174400).

255636864 is an abundant number, since it is smaller than the sum of its proper divisors (606711936).

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

255636864 is a wasteful number, since it uses less digits than its factorization.

255636864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10597 (or 10579 counting only the distinct ones).

The product of its digits is 1036800, while the sum is 45.

The square root of 255636864 is about 15988.6479728587. The cubic root of 255636864 is about 634.6600482640.

The spelling of 255636864 in words is "two hundred fifty-five million, six hundred thirty-six thousand, eight hundred sixty-four".