12640287 has 16 divisors (see below), whose sum is σ = 18663552. Its totient is φ = 7545120.

The previous prime is 12640283. The next prime is 12640291. The reversal of 12640287 is 78204621.

It is an interprime number because it is at equal distance from previous prime (12640283) and next prime (12640291).

It is not a de Polignac number, because 12640287 - 2² = 12640283 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 (12640283) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 648 + ... + 5069.

It is an arithmetic number, because the mean of its divisors is an integer number (1166472).

Almost surely, 2^12640287 is an apocalyptic number.

12640287 is a deficient number, since it is larger than the sum of its proper divisors (6023265).

12640287 is a wasteful number, since it uses less digits than its factorization.

12640287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5798.

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 12640287 is about 3555.3181292256. The cubic root of 12640287 is about 232.9444199307.

The spelling of 12640287 in words is "twelve million, six hundred forty thousand, two hundred eighty-seven".