31040024240 has 160 divisors (see below), whose sum is σ = 74581762176. Its totient is φ = 12010127360.

The previous prime is 31040024237. The next prime is 31040024251. The reversal of 31040024240 is 4242004013.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 87931904 + ... + 87932256.

Almost surely, 2^31040024240 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 31040024240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37290881088).

31040024240 is an abundant number, since it is smaller than the sum of its proper divisors (43541737936).

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

31040024240 is a wasteful number, since it uses less digits than its factorization.

31040024240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 687 (or 681 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 31040024240 its reverse (4242004013), we get a palindrome (35282028253).

The spelling of 31040024240 in words is "thirty-one billion, forty million, twenty-four thousand, two hundred forty".