12728436 has 36 divisors (see below), whose sum is σ = 34550208. Its totient is φ = 3636528.

The previous prime is 12728389. The next prime is 12728447. The reversal of 12728436 is 63482721.

It is a junction number, because it is equal to n+sod(n) for n = 12728397 and 12728406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10236 + ... + 11411.

It is an arithmetic number, because the mean of its divisors is an integer number (959728).

Almost surely, 2^12728436 is an apocalyptic number.

It is an amenable number.

12728436 is an abundant number, since it is smaller than the sum of its proper divisors (21821772).

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

12728436 is a wasteful number, since it uses less digits than its factorization.

12728436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21668 (or 21659 counting only the distinct ones).

The product of its digits is 16128, while the sum is 33.

The square root of 12728436 is about 3567.6933724747. The cubic root of 12728436 is about 233.4846573959.

The spelling of 12728436 in words is "twelve million, seven hundred twenty-eight thousand, four hundred thirty-six".