12640685 has 8 divisors (see below), whose sum is σ = 15828480. Its totient is φ = 9672784.

The previous prime is 12640657. The next prime is 12640687. The reversal of 12640685 is 58604621.

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

It is a cyclic number.

It is not a de Polignac number, because 12640685 - 2⁸ = 12640429 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12640687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54845 + ... + 55074.

It is an arithmetic number, because the mean of its divisors is an integer number (1978560).

Almost surely, 2^12640685 is an apocalyptic number.

It is an amenable number.

12640685 is a deficient number, since it is larger than the sum of its proper divisors (3187795).

12640685 is a wasteful number, since it uses less digits than its factorization.

12640685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109947.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 12640685 is about 3555.3741012726. The cubic root of 12640685 is about 232.9468647831.

The spelling of 12640685 in words is "twelve million, six hundred forty thousand, six hundred eighty-five".