631668156 has 96 divisors (see below), whose sum is σ = 1731287040. Its totient is φ = 175509504.

The previous prime is 631668143. The next prime is 631668173. The reversal of 631668156 is 651866136.

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 31 ways as a sum of consecutive naturals, for example, 761550 + ... + 762378.

It is an arithmetic number, because the mean of its divisors is an integer number (18034240).

Almost surely, 2^631668156 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 631668156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (865643520).

631668156 is an abundant number, since it is smaller than the sum of its proper divisors (1099618884).

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

631668156 is a wasteful number, since it uses less digits than its factorization.

631668156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1083 (or 1081 counting only the distinct ones).

The product of its digits is 155520, while the sum is 42.

The square root of 631668156 is about 25133.0092905724. The cubic root of 631668156 is about 858.0178597790.

The spelling of 631668156 in words is "six hundred thirty-one million, six hundred sixty-eight thousand, one hundred fifty-six".