56661604 has 12 divisors (see below), whose sum is σ = 103469184. Its totient is φ = 27098984.

The previous prime is 56661601. The next prime is 56661607. The reversal of 56661604 is 40616665.

It is an interprime number because it is at equal distance from previous prime (56661601) and next prime (56661607).

It is a self number, because there is not a number n which added to its sum of digits gives 56661604.

It is not an unprimeable number, because it can be changed into a prime (56661601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 307852 + ... + 308035.

It is an arithmetic number, because the mean of its divisors is an integer number (8622432).

Almost surely, 2^56661604 is an apocalyptic number.

It is an amenable number.

56661604 is a deficient number, since it is larger than the sum of its proper divisors (46807580).

56661604 is a wasteful number, since it uses less digits than its factorization.

56661604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 615914 (or 615912 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 56661604 is about 7527.3902516078. The cubic root of 56661604 is about 384.0870118939.

The spelling of 56661604 in words is "fifty-six million, six hundred sixty-one thousand, six hundred four".