656564764 has 12 divisors (see below), whose sum is σ = 1175709304. Its totient is φ = 320647824.

The previous prime is 656564749. The next prime is 656564767. The reversal of 656564764 is 467465656.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656564767) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1908447 + ... + 1908790.

Almost surely, 2^656564764 is an apocalyptic number.

It is an amenable number.

656564764 is a deficient number, since it is larger than the sum of its proper divisors (519144540).

656564764 is a wasteful number, since it uses less digits than its factorization.

656564764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3817284 (or 3817282 counting only the distinct ones).

The product of its digits is 3628800, while the sum is 49.

The square root of 656564764 is about 25623.5197426115. The cubic root of 656564764 is about 869.1455759096.

The spelling of 656564764 in words is "six hundred fifty-six million, five hundred sixty-four thousand, seven hundred sixty-four".