56569656 has 128 divisors (see below), whose sum is σ = 169827840. Its totient is φ = 15475200.

The previous prime is 56569621. The next prime is 56569661. The reversal of 56569656 is 65696565.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 181741 + ... + 182051.

It is an arithmetic number, because the mean of its divisors is an integer number (1326780).

Almost surely, 2^56569656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 56569656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84913920).

56569656 is an abundant number, since it is smaller than the sum of its proper divisors (113258184).

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

56569656 is a wasteful number, since it uses less digits than its factorization.

56569656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397 (or 393 counting only the distinct ones).

The product of its digits is 1458000, while the sum is 48.

The square root of 56569656 is about 7521.2802101770. The cubic root of 56569656 is about 383.8791394816.

The spelling of 56569656 in words is "fifty-six million, five hundred sixty-nine thousand, six hundred fifty-six".