664803904 has 28 divisors (see below), whose sum is σ = 1396823724. Its totient is φ = 312848384.

The previous prime is 664803899. The next prime is 664803907. The reversal of 664803904 is 409308466.

It can be written as a sum of positive squares in 2 ways, for example, as 489294400 + 175509504 = 22120^2 + 13248^2 .

It is not an unprimeable number, because it can be changed into a prime (664803907) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 304429 + ... + 306604.

Almost surely, 2^664803904 is an apocalyptic number.

664803904 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

664803904 is an abundant number, since it is smaller than the sum of its proper divisors (732019820).

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

664803904 is a wasteful number, since it uses less digits than its factorization.

664803904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611062 (or 611052 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 40.

The square root of 664803904 is about 25783.7914977608. The cubic root of 664803904 is about 872.7660692139.

The spelling of 664803904 in words is "six hundred sixty-four million, eight hundred three thousand, nine hundred four".