668904004 has 12 divisors (see below), whose sum is σ = 1190422800. Its totient is φ = 328783208.

The previous prime is 668903999. The next prime is 668904023. The reversal of 668904004 is 400409866.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1416934 + ... + 1417405.

It is an arithmetic number, because the mean of its divisors is an integer number (99201900).

Almost surely, 2^668904004 is an apocalyptic number.

It is an amenable number.

668904004 is a deficient number, since it is larger than the sum of its proper divisors (521518796).

668904004 is a wasteful number, since it uses less digits than its factorization.

668904004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2834402 (or 2834400 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 668904004 is about 25863.1785362898. The cubic root of 668904004 is about 874.5566206480.

The spelling of 668904004 in words is "six hundred sixty-eight million, nine hundred four thousand, four".