631660432 has 80 divisors (see below), whose sum is σ = 1429877232. Its totient is φ = 267632640.

The previous prime is 631660423. The next prime is 631660439. The reversal of 631660432 is 234066136.

631660432 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 1449616 + 630210816 = 1204^2 + 25104^2 .

It is a junction number, because it is equal to n+sod(n) for n = 631660394 and 631660403.

It is not an unprimeable number, because it can be changed into a prime (631660439) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 142798 + ... + 147154.

Almost surely, 2^631660432 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 631660432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (714938616).

631660432 is an abundant number, since it is smaller than the sum of its proper divisors (798216800).

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

631660432 is a wasteful number, since it uses less digits than its factorization.

631660432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4436 (or 4430 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 31.

The square root of 631660432 is about 25132.8556276441. The cubic root of 631660432 is about 858.0143625012.

The spelling of 631660432 in words is "six hundred thirty-one million, six hundred sixty thousand, four hundred thirty-two".