668564376 has 32 divisors (see below), whose sum is σ = 1729047600. Its totient is φ = 215169920.

The previous prime is 668564311. The next prime is 668564447. The reversal of 668564376 is 673465866.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 479595 + ... + 480986.

Almost surely, 2^668564376 is an apocalyptic number.

It is an amenable number.

668564376 is an abundant number, since it is smaller than the sum of its proper divisors (1060483224).

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

668564376 is a wasteful number, since it uses less digits than its factorization.

668564376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 960619 (or 960615 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 51.

The square root of 668564376 is about 25856.6118430084. The cubic root of 668564376 is about 874.4085803719.

The spelling of 668564376 in words is "six hundred sixty-eight million, five hundred sixty-four thousand, three hundred seventy-six".