31113032320 has 64 divisors (see below), whose sum is σ = 74439793800. Its totient is φ = 12435140608.

The previous prime is 31113032299. The next prime is 31113032369. The reversal of 31113032320 is 2323031113.

It can be written as a sum of positive squares in 4 ways, for example, as 28135365696 + 2977666624 = 167736^2 + 54568^2 .

It is a tau number, because it is divible by the number of its divisors (64).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 798246 + ... + 836314.

Almost surely, 2^31113032320 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 31113032320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37219896900).

31113032320 is an abundant number, since it is smaller than the sum of its proper divisors (43326761480).

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

31113032320 is a wasteful number, since it uses less digits than its factorization.

31113032320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39365 (or 39353 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 31113032320 its reverse (2323031113), we get a palindrome (33436063433).

The spelling of 31113032320 in words is "thirty-one billion, one hundred thirteen million, thirty-two thousand, three hundred twenty".