631552220 has 24 divisors (see below), whose sum is σ = 1428280224. Its totient is φ = 233188416.

The previous prime is 631552217. The next prime is 631552237. The reversal of 631552220 is 22255136.

631552220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a self number, because there is not a number n which added to its sum of digits gives 631552220.

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, 1214264 + ... + 1214783.

It is an arithmetic number, because the mean of its divisors is an integer number (59511676).

Almost surely, 2^631552220 is an apocalyptic number.

It is an amenable number.

631552220 is an abundant number, since it is smaller than the sum of its proper divisors (796728004).

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

631552220 is a wasteful number, since it uses less digits than its factorization.

631552220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2429069 (or 2429067 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 631552220 is about 25130.7027358966. The cubic root of 631552220 is about 857.9653632035.

The spelling of 631552220 in words is "six hundred thirty-one million, five hundred fifty-two thousand, two hundred twenty".