12748779 has 32 divisors (see below), whose sum is σ = 19699200. Its totient is φ = 8143200.

The previous prime is 12748751. The next prime is 12748787. The reversal of 12748779 is 97784721.

It is a happy number.

It is not a de Polignac number, because 12748779 - 2⁷ = 12748651 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12748579) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 84354 + ... + 84504.

It is an arithmetic number, because the mean of its divisors is an integer number (615600).

Almost surely, 2^12748779 is an apocalyptic number.

12748779 is a deficient number, since it is larger than the sum of its proper divisors (6950421).

12748779 is a wasteful number, since it uses less digits than its factorization.

12748779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272 (or 266 counting only the distinct ones).

The product of its digits is 197568, while the sum is 45.

The square root of 12748779 is about 3570.5432359796. The cubic root of 12748779 is about 233.6089787766.

The spelling of 12748779 in words is "twelve million, seven hundred forty-eight thousand, seven hundred seventy-nine".