31187689792 has 112 divisors (see below), whose sum is σ = 71455686400. Its totient is φ = 13229568000.

The previous prime is 31187689777. The next prime is 31187689823. The reversal of 31187689792 is 29798678113.

It is a tau number, because it is divible by the number of its divisors (112).

It is a self number, because there is not a number n which added to its sum of digits gives 31187689792.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23608492 + ... + 23609812.

It is an arithmetic number, because the mean of its divisors is an integer number (637997200).

Almost surely, 2^31187689792 is an apocalyptic number.

31187689792 is a gapful number since it is divisible by the number (32) 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 31187689792, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35727843200).

31187689792 is an abundant number, since it is smaller than the sum of its proper divisors (40267996608).

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

31187689792 is a wasteful number, since it uses less digits than its factorization.

31187689792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1840 (or 1830 counting only the distinct ones).

The product of its digits is 9144576, while the sum is 61.

The spelling of 31187689792 in words is "thirty-one billion, one hundred eighty-seven million, six hundred eighty-nine thousand, seven hundred ninety-two".