664075700 has 18 divisors (see below), whose sum is σ = 1441044486. Its totient is φ = 265630240.

The previous prime is 664075681. The next prime is 664075721. The reversal of 664075700 is 7570466.

It can be written as a sum of positive squares in 3 ways, for example, as 64609444 + 599466256 = 8038^2 + 24484^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3320279 + ... + 3320478.

It is an arithmetic number, because the mean of its divisors is an integer number (80058027).

Almost surely, 2^664075700 is an apocalyptic number.

It is an amenable number.

664075700 is an abundant number, since it is smaller than the sum of its proper divisors (776968786).

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

664075700 is a wasteful number, since it uses less digits than its factorization.

664075700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6640771 (or 6640764 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 35.

The square root of 664075700 is about 25769.6662764577. Note that the first 3 decimals coincide. The cubic root of 664075700 is about 872.4472865201.

The spelling of 664075700 in words is "six hundred sixty-four million, seventy-five thousand, seven hundred".