631361904 has 80 divisors (see below), whose sum is σ = 1690987008. Its totient is φ = 202853376.

The previous prime is 631361873. The next prime is 631361921. The reversal of 631361904 is 409163136.

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, 149064 + ... + 153240.

Almost surely, 2^631361904 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 631361904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (845493504).

631361904 is an abundant number, since it is smaller than the sum of its proper divisors (1059625104).

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

631361904 is a wasteful number, since it uses less digits than its factorization.

631361904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4302 (or 4296 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 33.

The square root of 631361904 is about 25126.9159269497. The cubic root of 631361904 is about 857.8791729485.

The spelling of 631361904 in words is "six hundred thirty-one million, three hundred sixty-one thousand, nine hundred four".