12717728 has 12 divisors (see below), whose sum is σ = 25038090. Its totient is φ = 6358848.

The previous prime is 12717709. The next prime is 12717763. The reversal of 12717728 is 82771721.

It can be written as a sum of positive squares in only one way, i.e., 6822544 + 5895184 = 2612^2 + 2428^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198683 + ... + 198746.

Almost surely, 2^12717728 is an apocalyptic number.

It is an amenable number.

12717728 is a deficient number, since it is larger than the sum of its proper divisors (12320362).

12717728 is an equidigital number, since it uses as much as digits as its factorization.

12717728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397439 (or 397431 counting only the distinct ones).

The product of its digits is 10976, while the sum is 35.

The square root of 12717728 is about 3566.1923672175. The cubic root of 12717728 is about 233.4191647950.

The spelling of 12717728 in words is "twelve million, seven hundred seventeen thousand, seven hundred twenty-eight".