668777704 has 16 divisors (see below), whose sum is σ = 1433095200. Its totient is φ = 286618992.

The previous prime is 668777689. The next prime is 668777717. The reversal of 668777704 is 407777866.

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, 5971174 + ... + 5971285.

It is an arithmetic number, because the mean of its divisors is an integer number (89568450).

Almost surely, 2^668777704 is an apocalyptic number.

It is an amenable number.

668777704 is an abundant number, since it is smaller than the sum of its proper divisors (764317496).

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

668777704 is a wasteful number, since it uses less digits than its factorization.

668777704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11942472 (or 11942468 counting only the distinct ones).

The product of its (nonzero) digits is 2765952, while the sum is 52.

The square root of 668777704 is about 25860.7367257779. The cubic root of 668777704 is about 874.5015736591.

The spelling of 668777704 in words is "six hundred sixty-eight million, seven hundred seventy-seven thousand, seven hundred four".