256556136 has 32 divisors (see below), whose sum is σ = 643960800. Its totient is φ = 85176000.

The previous prime is 256556101. The next prime is 256556141. The reversal of 256556136 is 631655652.

It is a junction number, because it is equal to n+sod(n) for n = 256556094 and 256556103.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15271 + ... + 27318.

It is an arithmetic number, because the mean of its divisors is an integer number (20123775).

Almost surely, 2^256556136 is an apocalyptic number.

It is an amenable number.

256556136 is an abundant number, since it is smaller than the sum of its proper divisors (387404664).

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

256556136 is a wasteful number, since it uses less digits than its factorization.

256556136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42849 (or 42845 counting only the distinct ones).

The product of its digits is 162000, while the sum is 39.

The square root of 256556136 is about 16017.3698215406. The cubic root of 256556136 is about 635.4198855619.

The spelling of 256556136 in words is "two hundred fifty-six million, five hundred fifty-six thousand, one hundred thirty-six".