12678728 has 16 divisors (see below), whose sum is σ = 24163260. Its totient is φ = 6235200.

The previous prime is 12678709. The next prime is 12678739. The reversal of 12678728 is 82787621.

It can be written as a sum of positive squares in 2 ways, for example, as 11682724 + 996004 = 3418^2 + 998^2 .

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, 12503 + ... + 13478.

Almost surely, 2^12678728 is an apocalyptic number.

It is an amenable number.

12678728 is a deficient number, since it is larger than the sum of its proper divisors (11484532).

12678728 is a wasteful number, since it uses less digits than its factorization.

12678728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26048 (or 26044 counting only the distinct ones).

The product of its digits is 75264, while the sum is 41.

The square root of 12678728 is about 3560.7201518794. The cubic root of 12678728 is about 233.1803205426.

The spelling of 12678728 in words is "twelve million, six hundred seventy-eight thousand, seven hundred twenty-eight".