664400404 has 6 divisors (see below), whose sum is σ = 1162700714. Its totient is φ = 332200200.

The previous prime is 664400389. The next prime is 664400423. The reversal of 664400404 is 404004466.

664400404 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 653824900 + 10575504 = 25570^2 + 3252^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83050047 + ... + 83050054.

Almost surely, 2^664400404 is an apocalyptic number.

It is an amenable number.

664400404 is a deficient number, since it is larger than the sum of its proper divisors (498300310).

664400404 is a wasteful number, since it uses less digits than its factorization.

664400404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166100105 (or 166100103 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 28.

The square root of 664400404 is about 25775.9656269169. The cubic root of 664400404 is about 872.5894595508.

The spelling of 664400404 in words is "six hundred sixty-four million, four hundred thousand, four hundred four".