31980432 has 80 divisors (see below), whose sum is σ = 92619072. Its totient is φ = 9423360.

The previous prime is 31980427. The next prime is 31980457. The reversal of 31980432 is 23408913.

It is a self number, because there is not a number n which added to its sum of digits gives 31980432.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18718 + ... + 20354.

Almost surely, 2^31980432 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 31980432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46309536).

31980432 is an abundant number, since it is smaller than the sum of its proper divisors (60638640).

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

31980432 is a wasteful number, since it uses less digits than its factorization.

31980432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1696 (or 1690 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 31980432 is about 5655.1244018147. The cubic root of 31980432 is about 317.4154841489.

The spelling of 31980432 in words is "thirty-one million, nine hundred eighty thousand, four hundred thirty-two".