12778885 has 16 divisors (see below), whose sum is σ = 17611776. Its totient is φ = 8719488.

The previous prime is 12778873. The next prime is 12778933. The reversal of 12778885 is 58887721.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 12778885 - 2⁵ = 12778853 is a prime.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 7372 + ... + 8938.

It is an arithmetic number, because the mean of its divisors is an integer number (1100736).

Almost surely, 2^12778885 is an apocalyptic number.

It is an amenable number.

12778885 is a deficient number, since it is larger than the sum of its proper divisors (4832891).

12778885 is a wasteful number, since it uses less digits than its factorization.

12778885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1812.

The product of its digits is 250880, while the sum is 46.

The square root of 12778885 is about 3574.7566350732. The cubic root of 12778885 is about 233.7927219424.

The spelling of 12778885 in words is "twelve million, seven hundred seventy-eight thousand, eight hundred eighty-five".