631791072 has 72 divisors (see below), whose sum is σ = 1959998040. Its totient is φ = 191450880.

The previous prime is 631791049. The next prime is 631791073. The reversal of 631791072 is 270197136.

It is a happy number.

631791072 is a `hidden beast` number, since 631 + 7 + 9 + 10 + 7 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631791073) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 96547 + ... + 102882.

It is an arithmetic number, because the mean of its divisors is an integer number (27222195).

Almost surely, 2^631791072 is an apocalyptic number.

It is an amenable number.

631791072 is an abundant number, since it is smaller than the sum of its proper divisors (1328206968).

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

631791072 is a wasteful number, since it uses less digits than its factorization.

631791072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199456 (or 199445 counting only the distinct ones).

The product of its (nonzero) digits is 15876, while the sum is 36.

The square root of 631791072 is about 25135.4544816679. The cubic root of 631791072 is about 858.0735099292.

The spelling of 631791072 in words is "six hundred thirty-one million, seven hundred ninety-one thousand, seventy-two".