12536289840 has 80 divisors (see below), whose sum is σ = 40552190208. Its totient is φ = 3197660928.

The previous prime is 12536289823. The next prime is 12536289841. The reversal of 12536289840 is 4898263521.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 12536289840.

It is not an unprimeable number, because it can be changed into a prime (12536289841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1130014 + ... + 1141053.

Almost surely, 2^12536289840 is an apocalyptic number.

12536289840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12536289840 is an abundant number, since it is smaller than the sum of its proper divisors (28015900368).

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

12536289840 is a wasteful number, since it uses less digits than its factorization.

12536289840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2271106 (or 2271100 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 48.

The spelling of 12536289840 in words is "twelve billion, five hundred thirty-six million, two hundred eighty-nine thousand, eight hundred forty".