12638668 has 18 divisors (see below), whose sum is σ = 25729116. Its totient is φ = 5416488.

The previous prime is 12638663. The next prime is 12638671. The reversal of 12638668 is 86683621.

It is a plaindrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 12638668.

It is not an unprimeable number, because it can be changed into a prime (12638663) 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 5 ways as a sum of consecutive naturals, for example, 32046 + ... + 32437.

Almost surely, 2^12638668 is an apocalyptic number.

It is an amenable number.

12638668 is an abundant number, since it is smaller than the sum of its proper divisors (13090448).

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

12638668 is a wasteful number, since it uses less digits than its factorization.

12638668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64501 (or 64492 counting only the distinct ones).

The product of its digits is 82944, while the sum is 40.

The square root of 12638668 is about 3555.0904348553. The cubic root of 12638668 is about 232.9344741355.

The spelling of 12638668 in words is "twelve million, six hundred thirty-eight thousand, six hundred sixty-eight".