668702388 has 24 divisors (see below), whose sum is σ = 1561638400. Its totient is φ = 222710400.

The previous prime is 668702381. The next prime is 668702389. The reversal of 668702388 is 883207866.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668702381) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8788 + ... + 37611.

Almost surely, 2^668702388 is an apocalyptic number.

It is an amenable number.

668702388 is an abundant number, since it is smaller than the sum of its proper divisors (892936012).

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

668702388 is a wasteful number, since it uses less digits than its factorization.

668702388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47607 (or 47605 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 48.

The square root of 668702388 is about 25859.2805004316. The cubic root of 668702388 is about 874.4687443982.

The spelling of 668702388 in words is "six hundred sixty-eight million, seven hundred two thousand, three hundred eighty-eight".