664928972 has 12 divisors (see below), whose sum is σ = 1164213960. Its totient is φ = 332296416.

The previous prime is 664928933. The next prime is 664928983. The reversal of 664928972 is 279829466.

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, 32897 + ... + 49112.

It is an arithmetic number, because the mean of its divisors is an integer number (97017830).

Almost surely, 2^664928972 is an apocalyptic number.

It is an amenable number.

664928972 is a deficient number, since it is larger than the sum of its proper divisors (499284988).

664928972 is a wasteful number, since it uses less digits than its factorization.

664928972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84040 (or 84038 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 53.

The square root of 664928972 is about 25786.2167058295. The cubic root of 664928972 is about 872.8207962603.

The spelling of 664928972 in words is "six hundred sixty-four million, nine hundred twenty-eight thousand, nine hundred seventy-two".