12640138764 has 48 divisors (see below), whose sum is σ = 33044503296. Its totient is φ = 3726820800.

The previous prime is 12640138751. The next prime is 12640138799. The reversal of 12640138764 is 46783104621.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1289152 + ... + 1298919.

It is an arithmetic number, because the mean of its divisors is an integer number (688427152).

Almost surely, 2^12640138764 is an apocalyptic number.

It is an amenable number.

12640138764 is an abundant number, since it is smaller than the sum of its proper divisors (20404364532).

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

12640138764 is a wasteful number, since it uses less digits than its factorization.

12640138764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2588126 (or 2588124 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 42.

The spelling of 12640138764 in words is "twelve billion, six hundred forty million, one hundred thirty-eight thousand, seven hundred sixty-four".