12639564032 has 108 divisors (see below), whose sum is σ = 26426589840. Its totient is φ = 6032471040.

The previous prime is 12639564029. The next prime is 12639564053. The reversal of 12639564032 is 23046593621.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20419019 + ... + 20419637.

Almost surely, 2^12639564032 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12639564032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13213294920).

12639564032 is an abundant number, since it is smaller than the sum of its proper divisors (13787025808).

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

12639564032 is an frugal number, since it uses more digits than its factorization.

12639564032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 780 (or 735 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 41.

The spelling of 12639564032 in words is "twelve billion, six hundred thirty-nine million, five hundred sixty-four thousand, thirty-two".