31267985868 has 36 divisors (see below), whose sum is σ = 90329737680. Its totient is φ = 8933710176.

The previous prime is 31267985839. The next prime is 31267985887. The reversal of 31267985868 is 86858976213.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 62039403 + ... + 62039906.

It is an arithmetic number, because the mean of its divisors is an integer number (2509159380).

Almost surely, 2^31267985868 is an apocalyptic number.

It is an amenable number.

31267985868 is an abundant number, since it is smaller than the sum of its proper divisors (59061751812).

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

31267985868 is a wasteful number, since it uses less digits than its factorization.

31267985868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124079326 (or 124079321 counting only the distinct ones).

The product of its digits is 34836480, while the sum is 63.

The spelling of 31267985868 in words is "thirty-one billion, two hundred sixty-seven million, nine hundred eighty-five thousand, eight hundred sixty-eight".