12856129728 has 56 divisors (see below), whose sum is σ = 36631735728. Its totient is φ = 3955731456.

The previous prime is 12856129717. The next prime is 12856129729. The reversal of 12856129728 is 82792165821.

12856129728 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (12856129729) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 2572851 + ... + 2577842.

It is an arithmetic number, because the mean of its divisors is an integer number (654138138).

Almost surely, 2^12856129728 is an apocalyptic number.

It is an amenable number.

12856129728 is an abundant number, since it is smaller than the sum of its proper divisors (23775606000).

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

12856129728 is a wasteful number, since it uses less digits than its factorization.

12856129728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5150721 (or 5150711 counting only the distinct ones).

The product of its digits is 967680, while the sum is 51.

The spelling of 12856129728 in words is "twelve billion, eight hundred fifty-six million, one hundred twenty-nine thousand, seven hundred twenty-eight".