631522878 has 48 divisors (see below), whose sum is σ = 1497016080. Its totient is φ = 177026304.

The previous prime is 631522861. The next prime is 631522883. The reversal of 631522878 is 878225136.

It is a super-2 number, since 2×631522878² = 797642290874805768, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4683 + ... + 35846.

It is an arithmetic number, because the mean of its divisors is an integer number (31187835).

Almost surely, 2^631522878 is an apocalyptic number.

631522878 is an abundant number, since it is smaller than the sum of its proper divisors (865493202).

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

631522878 is a wasteful number, since it uses less digits than its factorization.

631522878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40601 (or 40594 counting only the distinct ones).

The product of its digits is 161280, while the sum is 42.

The square root of 631522878 is about 25130.1189412227. The cubic root of 631522878 is about 857.9520759361.

The spelling of 631522878 in words is "six hundred thirty-one million, five hundred twenty-two thousand, eight hundred seventy-eight".