256645604 has 6 divisors (see below), whose sum is σ = 449129814. Its totient is φ = 128322800.

The previous prime is 256645603. The next prime is 256645633. The reversal of 256645604 is 406546652.

256645604 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 161544100 + 95101504 = 12710^2 + 9752^2 .

It is not an unprimeable number, because it can be changed into a prime (256645601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32080697 + ... + 32080704.

It is an arithmetic number, because the mean of its divisors is an integer number (74854969).

Almost surely, 2^256645604 is an apocalyptic number.

It is an amenable number.

256645604 is a deficient number, since it is larger than the sum of its proper divisors (192484210).

256645604 is a wasteful number, since it uses less digits than its factorization.

256645604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64161405 (or 64161403 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 38.

The square root of 256645604 is about 16020.1624211492. The cubic root of 256645604 is about 635.4937396251.

The spelling of 256645604 in words is "two hundred fifty-six million, six hundred forty-five thousand, six hundred four".