631708240 has 20 divisors (see below), whose sum is σ = 1468721844. Its totient is φ = 252683264.

The previous prime is 631708223. The next prime is 631708291. The reversal of 631708240 is 42807136.

It can be written as a sum of positive squares in 2 ways, for example, as 99760144 + 531948096 = 9988^2 + 23064^2 .

It is a tau number, because it is divible by the number of its divisors (20).

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 3 ways as a sum of consecutive naturals, for example, 3948097 + ... + 3948256.

Almost surely, 2^631708240 is an apocalyptic number.

It is an amenable number.

631708240 is an abundant number, since it is smaller than the sum of its proper divisors (837013604).

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

631708240 is a wasteful number, since it uses less digits than its factorization.

631708240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7896366 (or 7896360 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 631708240 is about 25133.8067152590. The cubic root of 631708240 is about 858.0360085807.

The spelling of 631708240 in words is "six hundred thirty-one million, seven hundred eight thousand, two hundred forty".