31805044188 has 12 divisors (see below), whose sum is σ = 74211769800. Its totient is φ = 10601681392.

The previous prime is 31805044181. The next prime is 31805044189. The reversal of 31805044188 is 88144050813.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31805044181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1325210163 + ... + 1325210186.

It is an arithmetic number, because the mean of its divisors is an integer number (6184314150).

Almost surely, 2^31805044188 is an apocalyptic number.

It is an amenable number.

31805044188 is an abundant number, since it is smaller than the sum of its proper divisors (42406725612).

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

31805044188 is a wasteful number, since it uses less digits than its factorization.

31805044188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2650420356 (or 2650420354 counting only the distinct ones).

The product of its (nonzero) digits is 122880, while the sum is 42.

The spelling of 31805044188 in words is "thirty-one billion, eight hundred five million, forty-four thousand, one hundred eighty-eight".