12640767 has 4 divisors (see below), whose sum is σ = 16854360. Its totient is φ = 8427176.

The previous prime is 12640763. The next prime is 12640783. The reversal of 12640767 is 76704621.

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

It is a cyclic number.

It is not a de Polignac number, because 12640767 - 2² = 12640763 is a prime.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12640763) 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, 2106792 + ... + 2106797.

It is an arithmetic number, because the mean of its divisors is an integer number (4213590).

Almost surely, 2^12640767 is an apocalyptic number.

12640767 is a deficient number, since it is larger than the sum of its proper divisors (4213593).

12640767 is an equidigital number, since it uses as much as digits as its factorization.

12640767 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4213592.

The product of its (nonzero) digits is 14112, while the sum is 33.

The square root of 12640767 is about 3555.3856330924. The cubic root of 12640767 is about 232.9473684900.

The spelling of 12640767 in words is "twelve million, six hundred forty thousand, seven hundred sixty-seven".