668394672 has 40 divisors (see below), whose sum is σ = 1883659200. Its totient is φ = 202543680.

The previous prime is 668394637. The next prime is 668394691. The reversal of 668394672 is 276493866.

It is a happy 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, 632422 + ... + 633477.

It is an arithmetic number, because the mean of its divisors is an integer number (47091480).

Almost surely, 2^668394672 is an apocalyptic number.

It is an amenable number.

668394672 is an abundant number, since it is smaller than the sum of its proper divisors (1215264528).

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

668394672 is a wasteful number, since it uses less digits than its factorization.

668394672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1265921 (or 1265915 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 51.

The square root of 668394672 is about 25853.3299982807. The cubic root of 668394672 is about 874.3345893965.

The spelling of 668394672 in words is "six hundred sixty-eight million, three hundred ninety-four thousand, six hundred seventy-two".