631305564 has 48 divisors (see below), whose sum is σ = 1551529728. Its totient is φ = 199395328.

The previous prime is 631305539. The next prime is 631305583. The reversal of 631305564 is 465503136.

631305564 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18844 + ... + 40220.

It is an arithmetic number, because the mean of its divisors is an integer number (32323536).

Almost surely, 2^631305564 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 631305564, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (775764864).

631305564 is an abundant number, since it is smaller than the sum of its proper divisors (920224164).

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

631305564 is a wasteful number, since it uses less digits than its factorization.

631305564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21514 (or 21512 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 33.

The square root of 631305564 is about 25125.7947933991. The cubic root of 631305564 is about 857.8536543830.

The spelling of 631305564 in words is "six hundred thirty-one million, three hundred five thousand, five hundred sixty-four".