12728457 has 24 divisors (see below), whose sum is σ = 21116160. Its totient is φ = 7237440.

The previous prime is 12728447. The next prime is 12728479. The reversal of 12728457 is 75482721.

12728457 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12728457 - 2¹⁸ = 12466313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12728447) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17344 + ... + 18062.

It is an arithmetic number, because the mean of its divisors is an integer number (879840).

Almost surely, 2^12728457 is an apocalyptic number.

It is an amenable number.

12728457 is a deficient number, since it is larger than the sum of its proper divisors (8387703).

12728457 is a wasteful number, since it uses less digits than its factorization.

12728457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1013 (or 1010 counting only the distinct ones).

The product of its digits is 31360, while the sum is 36.

The square root of 12728457 is about 3567.6963155515. The cubic root of 12728457 is about 233.4847858006.

The spelling of 12728457 in words is "twelve million, seven hundred twenty-eight thousand, four hundred fifty-seven".