256605604 has 6 divisors (see below), whose sum is σ = 449059814. Its totient is φ = 128302800.

The previous prime is 256605563. The next prime is 256605607. The reversal of 256605604 is 406506652.

It can be written as a sum of positive squares in only one way, i.e., 214329600 + 42276004 = 14640^2 + 6502^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 256605604.

It is not an unprimeable number, because it can be changed into a prime (256605607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32075697 + ... + 32075704.

Almost surely, 2^256605604 is an apocalyptic number.

It is an amenable number.

256605604 is a deficient number, since it is larger than the sum of its proper divisors (192454210).

256605604 is a wasteful number, since it uses less digits than its factorization.

256605604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64151405 (or 64151403 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 34.

The square root of 256605604 is about 16018.9139457081. The cubic root of 256605604 is about 635.4607225386.

The spelling of 256605604 in words is "two hundred fifty-six million, six hundred five thousand, six hundred four".