12664287 has 6 divisors (see below), whose sum is σ = 18292872. Its totient is φ = 8442852.

The previous prime is 12664277. The next prime is 12664307. The reversal of 12664287 is 78246621.

12664287 is a `hidden beast` number, since 1 + 2 + 6 + 642 + 8 + 7 = 666.

12664287 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12664287 - 2¹⁰ = 12663263 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12664207) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 703563 + ... + 703580.

It is an arithmetic number, because the mean of its divisors is an integer number (3048812).

Almost surely, 2^12664287 is an apocalyptic number.

12664287 is a deficient number, since it is larger than the sum of its proper divisors (5628585).

12664287 is a wasteful number, since it uses less digits than its factorization.

12664287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1407149 (or 1407146 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 12664287 is about 3558.6917540017. The cubic root of 12664287 is about 233.0917565508.

The spelling of 12664287 in words is "twelve million, six hundred sixty-four thousand, two hundred eighty-seven".