668797632 has 42 divisors (see below), whose sum is σ = 1916989308. Its totient is φ = 222932352.

The previous prime is 668797609. The next prime is 668797651. The reversal of 668797632 is 236797866.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 579978 + ... + 581129.

Almost surely, 2^668797632 is an apocalyptic number.

It is an amenable number.

668797632 is an abundant number, since it is smaller than the sum of its proper divisors (1248191676).

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

668797632 is a wasteful number, since it uses less digits than its factorization.

668797632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1161125 (or 1161112 counting only the distinct ones).

The product of its digits is 4572288, while the sum is 54.

The square root of 668797632 is about 25861.1220174222. The cubic root of 668797632 is about 874.5102596017.

The spelling of 668797632 in words is "six hundred sixty-eight million, seven hundred ninety-seven thousand, six hundred thirty-two".