12728728 has 32 divisors (see below), whose sum is σ = 24696000. Its totient is φ = 6147072.

The previous prime is 12728713. The next prime is 12728743. The reversal of 12728728 is 82782721.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (12728713) and next prime (12728743).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36298 + ... + 36646.

It is an arithmetic number, because the mean of its divisors is an integer number (771750).

Almost surely, 2^12728728 is an apocalyptic number.

It is an amenable number.

12728728 is a deficient number, since it is larger than the sum of its proper divisors (11967272).

12728728 is a wasteful number, since it uses less digits than its factorization.

12728728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 499 (or 495 counting only the distinct ones).

The product of its digits is 25088, while the sum is 37.

The square root of 12728728 is about 3567.7342950394. The cubic root of 12728728 is about 233.4864428208.

It can be divided in two parts, 12728 and 728, that added together give a square (13456 = 116²).

The spelling of 12728728 in words is "twelve million, seven hundred twenty-eight thousand, seven hundred twenty-eight".