12720973636 has 24 divisors (see below), whose sum is σ = 25500728960. Its totient is φ = 5439249792.

The previous prime is 12720973591. The next prime is 12720973637. The reversal of 12720973636 is 63637902721.

It is not an unprimeable number, because it can be changed into a prime (12720973637) 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, 512496 + ... + 536743.

Almost surely, 2^12720973636 is an apocalyptic number.

It is an amenable number.

12720973636 is an abundant number, since it is smaller than the sum of its proper divisors (12779755324).

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

12720973636 is a wasteful number, since it uses less digits than its factorization.

12720973636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1049683 (or 1049681 counting only the distinct ones).

The product of its (nonzero) digits is 571536, while the sum is 46.

The spelling of 12720973636 in words is "twelve billion, seven hundred twenty million, nine hundred seventy-three thousand, six hundred thirty-six".