256675664 has 20 divisors (see below), whose sum is σ = 568353504. Its totient is φ = 110003808.

The previous prime is 256675663. The next prime is 256675669. The reversal of 256675664 is 466576652.

It is a happy number.

256675664 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256675663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1145762 + ... + 1145985.

Almost surely, 2^256675664 is an apocalyptic number.

It is an amenable number.

256675664 is an abundant number, since it is smaller than the sum of its proper divisors (311677840).

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

256675664 is a wasteful number, since it uses less digits than its factorization.

256675664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2291762 (or 2291756 counting only the distinct ones).

The product of its digits is 1814400, while the sum is 47.

The square root of 256675664 is about 16021.1005864142. The cubic root of 256675664 is about 635.5185497079.

The spelling of 256675664 in words is "two hundred fifty-six million, six hundred seventy-five thousand, six hundred sixty-four".