664808404 has 24 divisors (see below), whose sum is σ = 1318852640. Its totient is φ = 290685024.

The previous prime is 664808393. The next prime is 664808407. The reversal of 664808404 is 404808466.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664808407) 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, 335454 + ... + 337429.

Almost surely, 2^664808404 is an apocalyptic number.

It is an amenable number.

664808404 is a deficient number, since it is larger than the sum of its proper divisors (654044236).

664808404 is a wasteful number, since it uses less digits than its factorization.

664808404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 672919 (or 672917 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 40.

The square root of 664808404 is about 25783.8787617379. The cubic root of 664808404 is about 872.7680384354.

The spelling of 664808404 in words is "six hundred sixty-four million, eight hundred eight thousand, four hundred four".