12640565 has 8 divisors (see below), whose sum is σ = 17335680. Its totient is φ = 8667792.

The previous prime is 12640561. The next prime is 12640601. The reversal of 12640565 is 56504621.

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

It is not a de Polignac number, because 12640565 - 2² = 12640561 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12640561) 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, 180545 + ... + 180614.

It is an arithmetic number, because the mean of its divisors is an integer number (2166960).

Almost surely, 2^12640565 is an apocalyptic number.

It is an amenable number.

12640565 is a deficient number, since it is larger than the sum of its proper divisors (4695115).

12640565 is an equidigital number, since it uses as much as digits as its factorization.

12640565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361171.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 12640565 is about 3555.3572253713. The cubic root of 12640565 is about 232.9461276471.

The spelling of 12640565 in words is "twelve million, six hundred forty thousand, five hundred sixty-five".