12728613 has 16 divisors (see below), whose sum is σ = 18040320. Its totient is φ = 7960176.

The previous prime is 12728609. The next prime is 12728657. The reversal of 12728613 is 31682721.

12728613 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 12728613 - 2² = 12728609 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12728663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5056 + ... + 7142.

It is an arithmetic number, because the mean of its divisors is an integer number (1127520).

Almost surely, 2^12728613 is an apocalyptic number.

It is an amenable number.

12728613 is a deficient number, since it is larger than the sum of its proper divisors (5311707).

12728613 is a wasteful number, since it uses less digits than its factorization.

12728613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2216.

The product of its digits is 4032, while the sum is 30.

The square root of 12728613 is about 3567.7181783319. The cubic root of 12728613 is about 233.4857396601.

The spelling of 12728613 in words is "twelve million, seven hundred twenty-eight thousand, six hundred thirteen".