12779728 has 20 divisors (see below), whose sum is σ = 26665828. Its totient is φ = 5898240.

The previous prime is 12779713. The next prime is 12779779. The reversal of 12779728 is 82797721.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 3489424 + 9290304 = 1868^2 + 3048^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30513 + ... + 30928.

Almost surely, 2^12779728 is an apocalyptic number.

It is an amenable number.

12779728 is an abundant number, since it is smaller than the sum of its proper divisors (13886100).

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

12779728 is a wasteful number, since it uses less digits than its factorization.

12779728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61462 (or 61456 counting only the distinct ones).

The product of its digits is 98784, while the sum is 43.

The square root of 12779728 is about 3574.8745432532. The cubic root of 12779728 is about 233.7978627908.

The spelling of 12779728 in words is "twelve million, seven hundred seventy-nine thousand, seven hundred twenty-eight".