12747728 has 20 divisors (see below), whose sum is σ = 28227360. Its totient is φ = 5463264.

The previous prime is 12747703. The next prime is 12747751. The reversal of 12747728 is 82774721.

It is a happy number.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 12747691 and 12747700.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56798 + ... + 57021.

It is an arithmetic number, because the mean of its divisors is an integer number (1411368).

Almost surely, 2^12747728 is an apocalyptic number.

It is an amenable number.

12747728 is an abundant number, since it is smaller than the sum of its proper divisors (15479632).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12747728 is a wasteful number, since it uses less digits than its factorization.

12747728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113834 (or 113828 counting only the distinct ones).

The product of its digits is 43904, while the sum is 38.

The square root of 12747728 is about 3570.3960564621. The cubic root of 12747728 is about 233.6025590825.

The spelling of 12747728 in words is "twelve million, seven hundred forty-seven thousand, seven hundred twenty-eight".