664672704 has 56 divisors (see below), whose sum is σ = 1763694720. Its totient is φ = 220917504.

The previous prime is 664672703. The next prime is 664672727. The reversal of 664672704 is 407276466.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664672703) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64107 + ... + 73749.

Almost surely, 2^664672704 is an apocalyptic number.

664672704 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 664672704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (881847360).

664672704 is an abundant number, since it is smaller than the sum of its proper divisors (1099022016).

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

664672704 is a wasteful number, since it uses less digits than its factorization.

664672704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10017 (or 10007 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 42.

The square root of 664672704 is about 25781.2471381817. The cubic root of 664672704 is about 872.7086515598.

The spelling of 664672704 in words is "six hundred sixty-four million, six hundred seventy-two thousand, seven hundred four".