31287768344 has 16 divisors (see below), whose sum is σ = 67045218000. Its totient is φ = 13409043552.

The previous prime is 31287768301. The next prime is 31287768367. The reversal of 31287768344 is 44386778213.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 279355019 + ... + 279355130.

It is an arithmetic number, because the mean of its divisors is an integer number (4190326125).

Almost surely, 2^31287768344 is an apocalyptic number.

It is an amenable number.

31287768344 is an abundant number, since it is smaller than the sum of its proper divisors (35757449656).

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

31287768344 is a wasteful number, since it uses less digits than its factorization.

31287768344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 558710162 (or 558710158 counting only the distinct ones).

The product of its digits is 5419008, while the sum is 53.

The spelling of 31287768344 in words is "thirty-one billion, two hundred eighty-seven million, seven hundred sixty-eight thousand, three hundred forty-four".