31108289440 has 24 divisors (see below), whose sum is σ = 73493334180. Its totient is φ = 12443315712.

The previous prime is 31108289419. The next prime is 31108289449. The reversal of 31108289440 is 4498280113.

It can be written as a sum of positive squares in 2 ways, for example, as 28868728464 + 2239560976 = 169908^2 + 47324^2 .

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 31108289393 and 31108289402.

It is not an unprimeable number, because it can be changed into a prime (31108289449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97213245 + ... + 97213564.

Almost surely, 2^31108289440 is an apocalyptic number.

It is an amenable number.

31108289440 is an abundant number, since it is smaller than the sum of its proper divisors (42385044740).

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

31108289440 is a wasteful number, since it uses less digits than its factorization.

31108289440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194426824 (or 194426816 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 40.

The spelling of 31108289440 in words is "thirty-one billion, one hundred eight million, two hundred eighty-nine thousand, four hundred forty".