31989760 has 112 divisors (see below), whose sum is σ = 84929472. Its totient is φ = 11468800.

The previous prime is 31989731. The next prime is 31989761. The reversal of 31989760 is 6798913.

It is not an unprimeable number, because it can be changed into a prime (31989761) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 450525 + ... + 450595.

Almost surely, 2^31989760 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 31989760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42464736).

31989760 is an abundant number, since it is smaller than the sum of its proper divisors (52939712).

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

31989760 is an equidigital number, since it uses as much as digits as its factorization.

31989760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113 (or 89 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 43.

The square root of 31989760 is about 5655.9490803931. The cubic root of 31989760 is about 317.4463422250.

The spelling of 31989760 in words is "thirty-one million, nine hundred eighty-nine thousand, seven hundred sixty".