12777728 has 72 divisors (see below), whose sum is σ = 27961920. Its totient is φ = 5806080.

The previous prime is 12777703. The next prime is 12777763. The reversal of 12777728 is 82777721.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 179933 + ... + 180003.

It is an arithmetic number, because the mean of its divisors is an integer number (388360).

Almost surely, 2^12777728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12777728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13980960).

12777728 is an abundant number, since it is smaller than the sum of its proper divisors (15184192).

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

12777728 is an equidigital number, since it uses as much as digits as its factorization.

12777728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143 (or 129 counting only the distinct ones).

The product of its digits is 76832, while the sum is 41.

The square root of 12777728 is about 3574.5948022119. The cubic root of 12777728 is about 233.7856658667.

The spelling of 12777728 in words is "twelve million, seven hundred seventy-seven thousand, seven hundred twenty-eight".