12668647 has 4 divisors (see below), whose sum is σ = 12721456. Its totient is φ = 12615840.

The previous prime is 12668641. The next prime is 12668659. The reversal of 12668647 is 74686621.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12668647 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12668641) 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 3 ways as a sum of consecutive naturals, for example, 26043 + ... + 26524.

It is an arithmetic number, because the mean of its divisors is an integer number (3180364).

Almost surely, 2^12668647 is an apocalyptic number.

12668647 is a deficient number, since it is larger than the sum of its proper divisors (52809).

12668647 is an equidigital number, since it uses as much as digits as its factorization.

12668647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52808.

The product of its digits is 96768, while the sum is 40.

The square root of 12668647 is about 3559.3042859525. The cubic root of 12668647 is about 233.1185027191.

The spelling of 12668647 in words is "twelve million, six hundred sixty-eight thousand, six hundred forty-seven".