668477172 has 48 divisors (see below), whose sum is σ = 1706265792. Its totient is φ = 202010880.

The previous prime is 668477167. The next prime is 668477189. The reversal of 668477172 is 271774866.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42448 + ... + 56024.

It is an arithmetic number, because the mean of its divisors is an integer number (35547204).

Almost surely, 2^668477172 is an apocalyptic number.

It is an amenable number.

668477172 is an abundant number, since it is smaller than the sum of its proper divisors (1037788620).

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

668477172 is a wasteful number, since it uses less digits than its factorization.

668477172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13968 (or 13966 counting only the distinct ones).

The product of its digits is 790272, while the sum is 48.

The square root of 668477172 is about 25854.9254881928. The cubic root of 668477172 is about 874.3705609759.

The spelling of 668477172 in words is "six hundred sixty-eight million, four hundred seventy-seven thousand, one hundred seventy-two".