12728139112 has 32 divisors (see below), whose sum is σ = 25871287680. Its totient is φ = 5835614400.

The previous prime is 12728139107. The next prime is 12728139131. The reversal of 12728139112 is 21193182721.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 389548 + ... + 420955.

It is an arithmetic number, because the mean of its divisors is an integer number (808477740).

Almost surely, 2^12728139112 is an apocalyptic number.

It is an amenable number.

12728139112 is an abundant number, since it is smaller than the sum of its proper divisors (13143148568).

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

12728139112 is a wasteful number, since it uses less digits than its factorization.

12728139112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 810673 (or 810669 counting only the distinct ones).

The product of its digits is 12096, while the sum is 37.

The spelling of 12728139112 in words is "twelve billion, seven hundred twenty-eight million, one hundred thirty-nine thousand, one hundred twelve".