12931739778 has 16 divisors (see below), whose sum is σ = 25864727616. Its totient is φ = 4310371920.

The previous prime is 12931739773. The next prime is 12931739803. The reversal of 12931739778 is 87793713921.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (12931739771) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 133723 + ... + 209153.

It is an arithmetic number, because the mean of its divisors is an integer number (1616545476).

Almost surely, 2^12931739778 is an apocalyptic number.

12931739778 is an abundant number, since it is smaller than the sum of its proper divisors (12932987838).

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

12931739778 is a wasteful number, since it uses less digits than its factorization.

12931739778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104009.

The product of its digits is 4000752, while the sum is 57.

The spelling of 12931739778 in words is "twelve billion, nine hundred thirty-one million, seven hundred thirty-nine thousand, seven hundred seventy-eight".