12728653 has 4 divisors (see below), whose sum is σ = 14547040. Its totient is φ = 10910268.

The previous prime is 12728609. The next prime is 12728657. The reversal of 12728653 is 35682721.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 35682721 = 523 ⋅68227.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12728653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12728657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 909183 + ... + 909196.

It is an arithmetic number, because the mean of its divisors is an integer number (3636760).

Almost surely, 2^12728653 is an apocalyptic number.

It is an amenable number.

12728653 is a deficient number, since it is larger than the sum of its proper divisors (1818387).

12728653 is an equidigital number, since it uses as much as digits as its factorization.

12728653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1818386.

The product of its digits is 20160, while the sum is 34.

The square root of 12728653 is about 3567.7237841515. The cubic root of 12728653 is about 233.4859842382.

The spelling of 12728653 in words is "twelve million, seven hundred twenty-eight thousand, six hundred fifty-three".