664712584 has 16 divisors (see below), whose sum is σ = 1246665420. Its totient is φ = 332268480.

The previous prime is 664712551. The next prime is 664712593. The reversal of 664712584 is 485217466.

It can be written as a sum of positive squares in 2 ways, for example, as 616131684 + 48580900 = 24822^2 + 6970^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 664712584.

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, 30342 + ... + 47434.

Almost surely, 2^664712584 is an apocalyptic number.

It is an amenable number.

664712584 is a deficient number, since it is larger than the sum of its proper divisors (581952836).

664712584 is a wasteful number, since it uses less digits than its factorization.

664712584 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21960 (or 21956 counting only the distinct ones).

The product of its digits is 322560, while the sum is 43.

The square root of 664712584 is about 25782.0205569695. The cubic root of 664712584 is about 872.7261052252.

The spelling of 664712584 in words is "six hundred sixty-four million, seven hundred twelve thousand, five hundred eighty-four".