12689442836 has 24 divisors (see below), whose sum is σ = 25381277376. Its totient is φ = 5437820160.

The previous prime is 12689442827. The next prime is 12689442841. The reversal of 12689442836 is 63824498621.

It is a happy number.

It is a super-2 number, since 2×12689442836² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 539555 + ... + 562581.

It is an arithmetic number, because the mean of its divisors is an integer number (1057553224).

Almost surely, 2^12689442836 is an apocalyptic number.

It is an amenable number.

12689442836 is an abundant number, since it is smaller than the sum of its proper divisors (12691834540).

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

12689442836 is a wasteful number, since it uses less digits than its factorization.

12689442836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42719 (or 42717 counting only the distinct ones).

The product of its digits is 3981312, while the sum is 53.

The spelling of 12689442836 in words is "twelve billion, six hundred eighty-nine million, four hundred forty-two thousand, eight hundred thirty-six".