12721372640 has 24 divisors (see below), whose sum is σ = 30054243240. Its totient is φ = 5088548992.

The previous prime is 12721372591. The next prime is 12721372661. The reversal of 12721372640 is 4627312721.

12721372640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 12721372640.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39754130 + ... + 39754449.

It is an arithmetic number, because the mean of its divisors is an integer number (1252260135).

Almost surely, 2^12721372640 is an apocalyptic number.

12721372640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12721372640 is an abundant number, since it is smaller than the sum of its proper divisors (17332870600).

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

12721372640 is an equidigital number, since it uses as much as digits as its factorization.

12721372640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79508594 (or 79508586 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 35.

The spelling of 12721372640 in words is "twelve billion, seven hundred twenty-one million, three hundred seventy-two thousand, six hundred forty".