256500680 has 32 divisors (see below), whose sum is σ = 580962240. Its totient is φ = 101918400.

The previous prime is 256500661. The next prime is 256500701. The reversal of 256500680 is 86005652.

It is a happy number.

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, 15194 + ... + 27273.

It is an arithmetic number, because the mean of its divisors is an integer number (18155070).

Almost surely, 2^256500680 is an apocalyptic number.

256500680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256500680 is an abundant number, since it is smaller than the sum of its proper divisors (324461560).

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

256500680 is a wasteful number, since it uses less digits than its factorization.

256500680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42629 (or 42625 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 256500680 is about 16015.6386073113. The cubic root of 256500680 is about 635.3740991114.

The spelling of 256500680 in words is "two hundred fifty-six million, five hundred thousand, six hundred eighty".