31688733012 has 48 divisors (see below), whose sum is σ = 75249699840. Its totient is φ = 10377288928.

The previous prime is 31688732963. The next prime is 31688733017. The reversal of 31688733012 is 21033788613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31688733017) 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 15 ways as a sum of consecutive naturals, for example, 89413 + ... + 267155.

It is an arithmetic number, because the mean of its divisors is an integer number (1567702080).

Almost surely, 2^31688733012 is an apocalyptic number.

It is an amenable number.

31688733012 is an abundant number, since it is smaller than the sum of its proper divisors (43560966828).

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

31688733012 is a wasteful number, since it uses less digits than its factorization.

31688733012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178012 (or 178010 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 42.

The spelling of 31688733012 in words is "thirty-one billion, six hundred eighty-eight million, seven hundred thirty-three thousand, twelve".