664972396 has 12 divisors (see below), whose sum is σ = 1269492840. Its totient is φ = 302260160.

The previous prime is 664972331. The next prime is 664972411. The reversal of 664972396 is 693279466.

664972396 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 3 ways as a sum of consecutive naturals, for example, 7556461 + ... + 7556548.

It is an arithmetic number, because the mean of its divisors is an integer number (105791070).

Almost surely, 2^664972396 is an apocalyptic number.

It is an amenable number.

664972396 is a deficient number, since it is larger than the sum of its proper divisors (604520444).

664972396 is a wasteful number, since it uses less digits than its factorization.

664972396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15113024 (or 15113022 counting only the distinct ones).

The product of its digits is 2939328, while the sum is 52.

The square root of 664972396 is about 25787.0586922976. The cubic root of 664972396 is about 872.8397960567.

The spelling of 664972396 in words is "six hundred sixty-four million, nine hundred seventy-two thousand, three hundred ninety-six".