31368768687 has 12 divisors (see below), whose sum is σ = 45478887480. Its totient is φ = 20834769168.

The previous prime is 31368768631. The next prime is 31368768709. The reversal of 31368768687 is 78686786313.

It is not a de Polignac number, because 31368768687 - 2⁷ = 31368768559 is a prime.

It is a super-4 number, since 4×31368768687⁴ (a number of 43 digits) contains 4444 as substring.

It is a hoax number, since the sum of its digits (63) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31368768617) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6476053 + ... + 6480894.

It is an arithmetic number, because the mean of its divisors is an integer number (3789907290).

Almost surely, 2^31368768687 is an apocalyptic number.

31368768687 is a deficient number, since it is larger than the sum of its proper divisors (14110118793).

31368768687 is a wasteful number, since it uses less digits than its factorization.

31368768687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12957222 (or 12957219 counting only the distinct ones).

The product of its digits is 48771072, while the sum is 63.

The spelling of 31368768687 in words is "thirty-one billion, three hundred sixty-eight million, seven hundred sixty-eight thousand, six hundred eighty-seven".