12891637788 has 36 divisors (see below), whose sum is σ = 31747007880. Its totient is φ = 4071042144.

The previous prime is 12891637763. The next prime is 12891637789. The reversal of 12891637788 is 88773619821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12891637789) 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, 1483623 + ... + 1492286.

It is an arithmetic number, because the mean of its divisors is an integer number (881861330).

Almost surely, 2^12891637788 is an apocalyptic number.

It is an amenable number.

12891637788 is an abundant number, since it is smaller than the sum of its proper divisors (18855370092).

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

12891637788 is a wasteful number, since it uses less digits than its factorization.

12891637788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2975954 (or 2975933 counting only the distinct ones).

The product of its digits is 8128512, while the sum is 60.

The spelling of 12891637788 in words is "twelve billion, eight hundred ninety-one million, six hundred thirty-seven thousand, seven hundred eighty-eight".