12728556 has 48 divisors (see below), whose sum is σ = 34742400. Its totient is φ = 4018896.

The previous prime is 12728549. The next prime is 12728561. The reversal of 12728556 is 65582721.

It is a happy number.

It is a super-2 number, since 2×12728556² = 324032275690272, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 12728556.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1050 + ... + 5153.

It is an arithmetic number, because the mean of its divisors is an integer number (723800).

Almost surely, 2^12728556 is an apocalyptic number.

It is an amenable number.

12728556 is an abundant number, since it is smaller than the sum of its proper divisors (22013844).

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

12728556 is a wasteful number, since it uses less digits than its factorization.

12728556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6235 (or 6227 counting only the distinct ones).

The product of its digits is 33600, while the sum is 36.

The square root of 12728556 is about 3567.7101900238. The cubic root of 12728556 is about 233.4853911354.

The spelling of 12728556 in words is "twelve million, seven hundred twenty-eight thousand, five hundred fifty-six".