31394867880 has 64 divisors (see below), whose sum is σ = 94903617600. Its totient is φ = 8308052480.

The previous prime is 31394867869. The next prime is 31394867893. The reversal of 31394867880 is 8876849313.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 31394867880.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 982845 + ... + 1014284.

It is an arithmetic number, because the mean of its divisors is an integer number (1482869025).

Almost surely, 2^31394867880 is an apocalyptic number.

31394867880 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31394867880 is an abundant number, since it is smaller than the sum of its proper divisors (63508749720).

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

31394867880 is a wasteful number, since it uses less digits than its factorization.

31394867880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1997274 (or 1997270 counting only the distinct ones).

The product of its (nonzero) digits is 6967296, while the sum is 57.

The spelling of 31394867880 in words is "thirty-one billion, three hundred ninety-four million, eight hundred sixty-seven thousand, eight hundred eighty".