12728765 has 16 divisors (see below), whose sum is σ = 18376320. Its totient is φ = 8268480.

The previous prime is 12728759. The next prime is 12728773. The reversal of 12728765 is 56782721.

It is not a de Polignac number, because 12728765 - 2⁸ = 12728509 is a prime.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8906 + ... + 10235.

It is an arithmetic number, because the mean of its divisors is an integer number (1148520).

Almost surely, 2^12728765 is an apocalyptic number.

It is an amenable number.

12728765 is a deficient number, since it is larger than the sum of its proper divisors (5647555).

12728765 is a wasteful number, since it uses less digits than its factorization.

12728765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19172.

The product of its digits is 47040, while the sum is 38.

The square root of 12728765 is about 3567.7394803993. The cubic root of 12728765 is about 233.4866690542.

The spelling of 12728765 in words is "twelve million, seven hundred twenty-eight thousand, seven hundred sixty-five".