664331172 has 24 divisors (see below), whose sum is σ = 1617502656. Its totient is φ = 211815648.

The previous prime is 664331141. The next prime is 664331183. The reversal of 664331172 is 271133466.

664331172 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 7 ways as a sum of consecutive naturals, for example, 1203223 + ... + 1203774.

It is an arithmetic number, because the mean of its divisors is an integer number (67395944).

Almost surely, 2^664331172 is an apocalyptic number.

It is an amenable number.

664331172 is an abundant number, since it is smaller than the sum of its proper divisors (953171484).

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

664331172 is a wasteful number, since it uses less digits than its factorization.

664331172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2407027 (or 2407025 counting only the distinct ones).

The product of its digits is 18144, while the sum is 33.

The square root of 664331172 is about 25774.6226354529. The cubic root of 664331172 is about 872.5591499104.

The spelling of 664331172 in words is "six hundred sixty-four million, three hundred thirty-one thousand, one hundred seventy-two".