12728216 has 32 divisors (see below), whose sum is σ = 25023600. Its totient is φ = 6061440.

The previous prime is 12728203. The next prime is 12728227. The reversal of 12728216 is 61282721.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 18926 + ... + 19586.

Almost surely, 2^12728216 is an apocalyptic number.

It is an amenable number.

12728216 is a deficient number, since it is larger than the sum of its proper divisors (12295384).

12728216 is a wasteful number, since it uses less digits than its factorization.

12728216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 779 (or 775 counting only the distinct ones).

The product of its digits is 2688, while the sum is 29.

The square root of 12728216 is about 3567.6625400954. The cubic root of 12728216 is about 233.4833121947.

The spelling of 12728216 in words is "twelve million, seven hundred twenty-eight thousand, two hundred sixteen".