12643660 has 24 divisors (see below), whose sum is σ = 27409536. Its totient is φ = 4894080.

The previous prime is 12643643. The next prime is 12643661. The reversal of 12643660 is 6634621.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (12643661) 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, 9577 + ... + 10816.

It is an arithmetic number, because the mean of its divisors is an integer number (1142064).

Almost surely, 2^12643660 is an apocalyptic number.

12643660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12643660 is an abundant number, since it is smaller than the sum of its proper divisors (14765876).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12643660 is a wasteful number, since it uses less digits than its factorization.

12643660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20433 (or 20431 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 12643660 is about 3555.7924573856. The cubic root of 12643660 is about 232.9651381220.

The spelling of 12643660 in words is "twelve million, six hundred forty-three thousand, six hundred sixty".