668692388 has 24 divisors (see below), whose sum is σ = 1440261312. Its totient is φ = 264537504.

The previous prime is 668692319. The next prime is 668692397. The reversal of 668692388 is 883296866.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 918170 + ... + 918897.

It is an arithmetic number, because the mean of its divisors is an integer number (60010888).

Almost surely, 2^668692388 is an apocalyptic number.

It is an amenable number.

668692388 is an abundant number, since it is smaller than the sum of its proper divisors (771568924).

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

668692388 is a wasteful number, since it uses less digits than its factorization.

668692388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1837091 (or 1837089 counting only the distinct ones).

The product of its digits is 5971968, while the sum is 56.

The square root of 668692388 is about 25859.0871455278. The cubic root of 668692388 is about 874.4643853434.

The spelling of 668692388 in words is "six hundred sixty-eight million, six hundred ninety-two thousand, three hundred eighty-eight".