31330880 has 112 divisors (see below), whose sum is σ = 86904576. Its totient is φ = 10536960.

The previous prime is 31330861. The next prime is 31330889. The reversal of 31330880 is 8803313.

It is a tau number, because it is divible by the number of its divisors (112).

It is not an unprimeable number, because it can be changed into a prime (31330889) 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, 158942 + ... + 159138.

Almost surely, 2^31330880 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 31330880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43452288).

31330880 is an abundant number, since it is smaller than the sum of its proper divisors (55573696).

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

31330880 is a wasteful number, since it uses less digits than its factorization.

31330880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292 (or 282 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 31330880 is about 5597.3993961482. The cubic root of 31330880 is about 315.2517681469.

The spelling of 31330880 in words is "thirty-one million, three hundred thirty thousand, eight hundred eighty".