12788665 has 8 divisors (see below), whose sum is σ = 15411528. Its totient is φ = 10187520.

The previous prime is 12788639. The next prime is 12788669. The reversal of 12788665 is 56688721.

12788665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 6927424 + 5861241 = 2632^2 + 2421^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-12788665 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12788669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4102 + ... + 6511.

It is an arithmetic number, because the mean of its divisors is an integer number (1926441).

Almost surely, 2^12788665 is an apocalyptic number.

It is an amenable number.

12788665 is a deficient number, since it is larger than the sum of its proper divisors (2622863).

12788665 is a wasteful number, since it uses less digits than its factorization.

12788665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10859.

The product of its digits is 161280, while the sum is 43.

The square root of 12788665 is about 3576.1242987346. The cubic root of 12788665 is about 233.8523492043.

The spelling of 12788665 in words is "twelve million, seven hundred eighty-eight thousand, six hundred sixty-five".