256636800 has 576 divisors, whose sum is σ = 1118083200. Its totient is φ = 54743040.

The previous prime is 256636799. The next prime is 256636883. The reversal of 256636800 is 8636652.

It is a tau number, because it is divible by the number of its divisors (576).

It is a super-2 number, since 2×256636800² = 131724894228480000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 3830367 + ... + 3830433.

Almost surely, 2^256636800 is an apocalyptic number.

256636800 is a gapful number since it is divisible by the number (20) 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 256636800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (559041600).

256636800 is an abundant number, since it is smaller than the sum of its proper divisors (861446400).

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

256636800 is a wasteful number, since it uses less digits than its factorization.

256636800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123 (or 103 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 256636800 is about 16019.8876400554. The cubic root of 256636800 is about 635.4864728588.

The spelling of 256636800 in words is "two hundred fifty-six million, six hundred thirty-six thousand, eight hundred".