631408656 has 20 divisors (see below), whose sum is σ = 1631139152. Its totient is φ = 210469536.

The previous prime is 631408637. The next prime is 631408681. The reversal of 631408656 is 656804136.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

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, 6577126 + ... + 6577221.

Almost surely, 2^631408656 is an apocalyptic number.

It is an amenable number.

631408656 is an abundant number, since it is smaller than the sum of its proper divisors (999730496).

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

631408656 is a wasteful number, since it uses less digits than its factorization.

631408656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13154358 (or 13154352 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 39.

The square root of 631408656 is about 25127.8462268456. The cubic root of 631408656 is about 857.9003475854.

The spelling of 631408656 in words is "six hundred thirty-one million, four hundred eight thousand, six hundred fifty-six".