256553864 has 32 divisors (see below), whose sum is σ = 550920000. Its totient is φ = 109719360.

The previous prime is 256553863. The next prime is 256553879. The reversal of 256553864 is 468355652.

256553864 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (256553863) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23354 + ... + 32534.

It is an arithmetic number, because the mean of its divisors is an integer number (17216250).

Almost surely, 2^256553864 is an apocalyptic number.

It is an amenable number.

256553864 is an abundant number, since it is smaller than the sum of its proper divisors (294366136).

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

256553864 is a wasteful number, since it uses less digits than its factorization.

256553864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9693 (or 9689 counting only the distinct ones).

The product of its digits is 864000, while the sum is 44.

The square root of 256553864 is about 16017.2988983786. The cubic root of 256553864 is about 635.4180098473.

The spelling of 256553864 in words is "two hundred fifty-six million, five hundred fifty-three thousand, eight hundred sixty-four".