664522608 has 20 divisors (see below), whose sum is σ = 1716683528. Its totient is φ = 221507520.

The previous prime is 664522597. The next prime is 664522633. The reversal of 664522608 is 806225466.

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, 6922063 + ... + 6922158.

Almost surely, 2^664522608 is an apocalyptic number.

It is an amenable number.

664522608 is an abundant number, since it is smaller than the sum of its proper divisors (1052160920).

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

664522608 is a wasteful number, since it uses less digits than its factorization.

664522608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13844232 (or 13844226 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 39.

The square root of 664522608 is about 25778.3360207753. The cubic root of 664522608 is about 872.6429550958.

The spelling of 664522608 in words is "six hundred sixty-four million, five hundred twenty-two thousand, six hundred eight".