631920864 has 96 divisors (see below), whose sum is σ = 1754403840. Its totient is φ = 198835200.

The previous prime is 631920859. The next prime is 631920881. The reversal of 631920864 is 468029136.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 119427 + ... + 124605.

It is an arithmetic number, because the mean of its divisors is an integer number (18275040).

Almost surely, 2^631920864 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 631920864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (877201920).

631920864 is an abundant number, since it is smaller than the sum of its proper divisors (1122482976).

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

631920864 is a wasteful number, since it uses less digits than its factorization.

631920864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5264 (or 5256 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 39.

The square root of 631920864 is about 25138.0362001490. The cubic root of 631920864 is about 858.1322653502.

The spelling of 631920864 in words is "six hundred thirty-one million, nine hundred twenty thousand, eight hundred sixty-four".