631697152 has 72 divisors (see below), whose sum is σ = 1371532176. Its totient is φ = 289161216.

The previous prime is 631697149. The next prime is 631697177. The reversal of 631697152 is 251796136.

It is a super-2 number, since 2×631697152² = 798082583689822208, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 159063 + ... + 162985.

It is an arithmetic number, because the mean of its divisors is an integer number (19049058).

Almost surely, 2^631697152 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 631697152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (685766088).

631697152 is an abundant number, since it is smaller than the sum of its proper divisors (739835024).

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

631697152 is a wasteful number, since it uses less digits than its factorization.

631697152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3993 (or 3979 counting only the distinct ones).

The product of its digits is 68040, while the sum is 40.

The square root of 631697152 is about 25133.5861348913. The cubic root of 631697152 is about 858.0309883523.

The spelling of 631697152 in words is "six hundred thirty-one million, six hundred ninety-seven thousand, one hundred fifty-two".