664967900 has 36 divisors (see below), whose sum is σ = 1444303392. Its totient is φ = 265743360.

The previous prime is 664967857. The next prime is 664967939. The reversal of 664967900 is 9769466.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 139964 + ... + 144636.

Almost surely, 2^664967900 is an apocalyptic number.

It is an amenable number.

664967900 is an abundant number, since it is smaller than the sum of its proper divisors (779335492).

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

664967900 is a wasteful number, since it uses less digits than its factorization.

664967900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6110 (or 6103 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 47.

The square root of 664967900 is about 25786.9715166399. The cubic root of 664967900 is about 872.8378289091.

The spelling of 664967900 in words is "six hundred sixty-four million, nine hundred sixty-seven thousand, nine hundred".