31688649912 has 32 divisors (see below), whose sum is σ = 79379153280. Its totient is φ = 10541879520.

The previous prime is 31688649877. The next prime is 31688649913. The reversal of 31688649912 is 21994688613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31688649913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1300414 + ... + 1324557.

It is an arithmetic number, because the mean of its divisors is an integer number (2480598540).

Almost surely, 2^31688649912 is an apocalyptic number.

It is an amenable number.

31688649912 is an abundant number, since it is smaller than the sum of its proper divisors (47690503368).

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

31688649912 is a wasteful number, since it uses less digits than its factorization.

31688649912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2625483 (or 2625479 counting only the distinct ones).

The product of its digits is 4478976, while the sum is 57.

The spelling of 31688649912 in words is "thirty-one billion, six hundred eighty-eight million, six hundred forty-nine thousand, nine hundred twelve".