631620864 has 108 divisors (see below), whose sum is σ = 2081331616. Its totient is φ = 180458496.

The previous prime is 631620853. The next prime is 631620919. The reversal of 631620864 is 468026136.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a zygodrome in base 3.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3454 + ... + 35709.

Almost surely, 2^631620864 is an apocalyptic number.

631620864 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 631620864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1040665808).

631620864 is an abundant number, since it is smaller than the sum of its proper divisors (1449710752).

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

631620864 is a wasteful number, since it uses less digits than its factorization.

631620864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39192 (or 39175 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 631620864 is about 25132.0684385508. The cubic root of 631620864 is about 857.9964464293.

The spelling of 631620864 in words is "six hundred thirty-one million, six hundred twenty thousand, eight hundred sixty-four".