31831888440 has 128 divisors (see below), whose sum is σ = 104228881920. Its totient is φ = 7712985600.

The previous prime is 31831888411. The next prime is 31831888489. The reversal of 31831888440 is 4488813813.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 31831888440.

It is a congruent number.

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, 3370525 + ... + 3379955.

It is an arithmetic number, because the mean of its divisors is an integer number (814288140).

Almost surely, 2^31831888440 is an apocalyptic number.

31831888440 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31831888440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52114440960).

31831888440 is an abundant number, since it is smaller than the sum of its proper divisors (72396993480).

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

31831888440 is a wasteful number, since it uses less digits than its factorization.

31831888440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12013 (or 12009 counting only the distinct ones).

The product of its (nonzero) digits is 589824, while the sum is 48.

The spelling of 31831888440 in words is "thirty-one billion, eight hundred thirty-one million, eight hundred eighty-eight thousand, four hundred forty".