664624372 has 12 divisors (see below), whose sum is σ = 1163278116. Its totient is φ = 332259200.

The previous prime is 664624343. The next prime is 664624417. The reversal of 664624372 is 273426466.

It can be written as a sum of positive squares in 2 ways, for example, as 519566436 + 145057936 = 22794^2 + 12044^2 .

It is a congruent number.

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, 32622 + ... + 48922.

It is an arithmetic number, because the mean of its divisors is an integer number (96939843).

Almost surely, 2^664624372 is an apocalyptic number.

It is an amenable number.

664624372 is a deficient number, since it is larger than the sum of its proper divisors (498653744).

664624372 is a wasteful number, since it uses less digits than its factorization.

664624372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26498 (or 26496 counting only the distinct ones).

The product of its digits is 290304, while the sum is 40.

The square root of 664624372 is about 25780.3097731583. The cubic root of 664624372 is about 872.6874979019.

The spelling of 664624372 in words is "six hundred sixty-four million, six hundred twenty-four thousand, three hundred seventy-two".