631904 has 72 divisors (see below), whose sum is σ = 1608768. Its totient is φ = 241920.

The previous prime is 631903. The next prime is 631913. The reversal of 631904 is 409136.

It is a self number, because there is not a number n which added to its sum of digits gives 631904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20369 + ... + 20399.

It is an arithmetic number, because the mean of its divisors is an integer number (22344).

2⁶³¹⁹⁰⁴ 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 631904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (804384).

631904 is an abundant number, since it is smaller than the sum of its proper divisors (976864).

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

631904 is a wasteful number, since it uses less digits than its factorization.

631904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68 (or 53 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 631904 is about 794.9238957284. The cubic root of 631904 is about 85.8124631656.

The spelling of 631904 in words is "six hundred thirty-one thousand, nine hundred four".