12728778 has 32 divisors (see below), whose sum is σ = 26550720. Its totient is φ = 4064640.

The previous prime is 12728773. The next prime is 12728831. The reversal of 12728778 is 87782721.

It is not an unprimeable number, because it can be changed into a prime (12728773) by changing a digit.

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, 14076 + ... + 14952.

It is an arithmetic number, because the mean of its divisors is an integer number (829710).

Almost surely, 2^12728778 is an apocalyptic number.

12728778 is an abundant number, since it is smaller than the sum of its proper divisors (13821942).

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

12728778 is a wasteful number, since it uses less digits than its factorization.

12728778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 982.

The product of its digits is 87808, while the sum is 42.

The square root of 12728778 is about 3567.7413022808. The cubic root of 12728778 is about 233.4867485415.

The spelling of 12728778 in words is "twelve million, seven hundred twenty-eight thousand, seven hundred seventy-eight".