668867844 has 36 divisors (see below), whose sum is σ = 1590774416. Its totient is φ = 218738208.

The previous prime is 668867821. The next prime is 668867851. The reversal of 668867844 is 448768866.

668867844 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23787 + ... + 43629.

Almost surely, 2^668867844 is an apocalyptic number.

It is an amenable number.

668867844 is an abundant number, since it is smaller than the sum of its proper divisors (921906572).

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

668867844 is a wasteful number, since it uses less digits than its factorization.

668867844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19956 (or 19901 counting only the distinct ones).

The product of its digits is 12386304, while the sum is 57.

The square root of 668867844 is about 25862.4794635008. The cubic root of 668867844 is about 874.5408612679.

The spelling of 668867844 in words is "six hundred sixty-eight million, eight hundred sixty-seven thousand, eight hundred forty-four".