12644705 has 4 divisors (see below), whose sum is σ = 15173652. Its totient is φ = 10115760.

The previous prime is 12644701. The next prime is 12644707. The reversal of 12644705 is 50744621.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9928801 + 2715904 = 3151^2 + 1648^2 .

It is not a de Polignac number, because 12644705 - 2² = 12644701 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12644701) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1264466 + ... + 1264475.

It is an arithmetic number, because the mean of its divisors is an integer number (3793413).

Almost surely, 2^12644705 is an apocalyptic number.

It is an amenable number.

12644705 is a deficient number, since it is larger than the sum of its proper divisors (2528947).

12644705 is an equidigital number, since it uses as much as digits as its factorization.

12644705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2528946.

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 12644705 is about 3555.9393976838. The cubic root of 12644705 is about 232.9715561439.

The spelling of 12644705 in words is "twelve million, six hundred forty-four thousand, seven hundred five".