668008904 has 8 divisors (see below), whose sum is σ = 1252516710. Its totient is φ = 334004448.

The previous prime is 668008883. The next prime is 668008907. The reversal of 668008904 is 409800866.

It can be written as a sum of positive squares in only one way, i.e., 590392804 + 77616100 = 24298^2 + 8810^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (668008907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41750549 + ... + 41750564.

Almost surely, 2^668008904 is an apocalyptic number.

It is an amenable number.

668008904 is a deficient number, since it is larger than the sum of its proper divisors (584507806).

668008904 is a wasteful number, since it uses less digits than its factorization.

668008904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83501119 (or 83501115 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 41.

The square root of 668008904 is about 25845.8682191177. The cubic root of 668008904 is about 874.1663478717.

The spelling of 668008904 in words is "six hundred sixty-eight million, eight thousand, nine hundred four".