668724328 has 16 divisors (see below), whose sum is σ = 1254380580. Its totient is φ = 334222848.

The previous prime is 668724313. The next prime is 668724337. The reversal of 668724328 is 823427866.

It can be written as a sum of positive squares in 2 ways, for example, as 582643044 + 86081284 = 24138^2 + 9278^2 .

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, 4626 + ... + 36862.

Almost surely, 2^668724328 is an apocalyptic number.

It is an amenable number.

668724328 is a deficient number, since it is larger than the sum of its proper divisors (585656252).

668724328 is a wasteful number, since it uses less digits than its factorization.

668724328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34836 (or 34832 counting only the distinct ones).

The product of its digits is 774144, while the sum is 46.

The square root of 668724328 is about 25859.7047160249. The cubic root of 668724328 is about 874.4783080121.

The spelling of 668724328 in words is "six hundred sixty-eight million, seven hundred twenty-four thousand, three hundred twenty-eight".