12728456 has 16 divisors (see below), whose sum is σ = 25701900. Its totient is φ = 5874624.

The previous prime is 12728447. The next prime is 12728479. The reversal of 12728456 is 65482721.

It can be written as a sum of positive squares in 2 ways, for example, as 12716356 + 12100 = 3566^2 + 110^2 .

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

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, 61091 + ... + 61298.

Almost surely, 2^12728456 is an apocalyptic number.

It is an amenable number.

12728456 is an abundant number, since it is smaller than the sum of its proper divisors (12973444).

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

12728456 is a wasteful number, since it uses less digits than its factorization.

12728456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122408 (or 122404 counting only the distinct ones).

The product of its digits is 26880, while the sum is 35.

The square root of 12728456 is about 3567.6961754051. The cubic root of 12728456 is about 233.4847796861.

The spelling of 12728456 in words is "twelve million, seven hundred twenty-eight thousand, four hundred fifty-six".