631869860 has 24 divisors (see below), whose sum is σ = 1359292536. Its totient is φ = 246583040.

The previous prime is 631869857. The next prime is 631869911. The reversal of 631869860 is 68968136.

It can be written as a sum of positive squares in 4 ways, for example, as 90935296 + 540934564 = 9536^2 + 23258^2 .

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 7 ways as a sum of consecutive naturals, for example, 384467 + ... + 386106.

It is an arithmetic number, because the mean of its divisors is an integer number (56637189).

Almost surely, 2^631869860 is an apocalyptic number.

It is an amenable number.

631869860 is an abundant number, since it is smaller than the sum of its proper divisors (727422676).

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

631869860 is a wasteful number, since it uses less digits than its factorization.

631869860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 770623 (or 770621 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 47.

The square root of 631869860 is about 25137.0217010687. The cubic root of 631869860 is about 858.1091773560.

The spelling of 631869860 in words is "six hundred thirty-one million, eight hundred sixty-nine thousand, eight hundred sixty".