56571664 has 40 divisors (see below), whose sum is σ = 117046080. Its totient is φ = 26409600.

The previous prime is 56571659. The next prime is 56571667. The reversal of 56571664 is 46617565.

It is not an unprimeable number, because it can be changed into a prime (56571667) 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, 20274 + ... + 22894.

It is an arithmetic number, because the mean of its divisors is an integer number (2926152).

Almost surely, 2^56571664 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 56571664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (58523040).

56571664 is an abundant number, since it is smaller than the sum of its proper divisors (60474416).

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

56571664 is a wasteful number, since it uses less digits than its factorization.

56571664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2719 (or 2713 counting only the distinct ones).

The product of its digits is 151200, while the sum is 40.

The square root of 56571664 is about 7521.4136969057. The cubic root of 56571664 is about 383.8836814937.

The spelling of 56571664 in words is "fifty-six million, five hundred seventy-one thousand, six hundred sixty-four".