12909647872 has 72 divisors (see below), whose sum is σ = 28196875980. Its totient is φ = 5860270080.

The previous prime is 12909647791. The next prime is 12909647893. The reversal of 12909647872 is 27874690921.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17053318 + ... + 17054074.

Almost surely, 2^12909647872 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 12909647872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14098437990).

12909647872 is an abundant number, since it is smaller than the sum of its proper divisors (15287228108).

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

12909647872 is an frugal number, since it uses more digits than its factorization.

12909647872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1547 (or 770 counting only the distinct ones).

The product of its (nonzero) digits is 3048192, while the sum is 55.

The spelling of 12909647872 in words is "twelve billion, nine hundred nine million, six hundred forty-seven thousand, eight hundred seventy-two".