664608368 has 20 divisors (see below), whose sum is σ = 1343665488. Its totient is φ = 317856000.

The previous prime is 664608331. The next prime is 664608377. The reversal of 664608368 is 863806466.

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, 902633 + ... + 903368.

Almost surely, 2^664608368 is an apocalyptic number.

It is an amenable number.

664608368 is an abundant number, since it is smaller than the sum of its proper divisors (679057120).

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

664608368 is a wasteful number, since it uses less digits than its factorization.

664608368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1806032 (or 1806026 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 47.

The square root of 664608368 is about 25779.9993793638. Note that the first 3 decimals coincide. The cubic root of 664608368 is about 872.6804931418.

The spelling of 664608368 in words is "six hundred sixty-four million, six hundred eight thousand, three hundred sixty-eight".