564640644 has 48 divisors (see below), whose sum is σ = 1352274560. Its totient is φ = 183306240.

The previous prime is 564640631. The next prime is 564640663. The reversal of 564640644 is 446046465.

564640644 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71652 + ... + 79140.

Almost surely, 2^564640644 is an apocalyptic number.

It is an amenable number.

564640644 is an abundant number, since it is smaller than the sum of its proper divisors (787633916).

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

564640644 is a wasteful number, since it uses less digits than its factorization.

564640644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7660 (or 7658 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 39.

The square root of 564640644 is about 23762.1683354024. The cubic root of 564640644 is about 826.5276349460.

The spelling of 564640644 in words is "five hundred sixty-four million, six hundred forty thousand, six hundred forty-four".