12732728 has 32 divisors (see below), whose sum is σ = 25446960. Its totient is φ = 5952000.

The previous prime is 12732721. The next prime is 12732737. The reversal of 12732728 is 82723721.

It is a junction number, because it is equal to n+sod(n) for n = 12732694 and 12732703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12732721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33950 + ... + 34322.

Almost surely, 2^12732728 is an apocalyptic number.

It is an amenable number.

12732728 is a deficient number, since it is larger than the sum of its proper divisors (12714232).

12732728 is a wasteful number, since it uses less digits than its factorization.

12732728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 647 (or 643 counting only the distinct ones).

The product of its digits is 9408, while the sum is 32.

The square root of 12732728 is about 3568.2948308681. The cubic root of 12732728 is about 233.5108979472.

The spelling of 12732728 in words is "twelve million, seven hundred thirty-two thousand, seven hundred twenty-eight".