664692972 has 48 divisors (see below), whose sum is σ = 1564738560. Its totient is φ = 219604672.

The previous prime is 664692937. The next prime is 664692989. The reversal of 664692972 is 279296466.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1132063 + ... + 1132649.

It is an arithmetic number, because the mean of its divisors is an integer number (32598720).

Almost surely, 2^664692972 is an apocalyptic number.

It is an amenable number.

664692972 is an abundant number, since it is smaller than the sum of its proper divisors (900045588).

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

664692972 is a wasteful number, since it uses less digits than its factorization.

664692972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1270 (or 1268 counting only the distinct ones).

The product of its digits is 1959552, while the sum is 51.

The square root of 664692972 is about 25781.6402115924. The cubic root of 664692972 is about 872.7175220304.

The spelling of 664692972 in words is "six hundred sixty-four million, six hundred ninety-two thousand, nine hundred seventy-two".