12768638 has 4 divisors (see below), whose sum is σ = 19152960. Its totient is φ = 6384318.

The previous prime is 12768619. The next prime is 12768641. The reversal of 12768638 is 83686721.

It is a happy number.

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12768595 and 12768604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3192158 + ... + 3192161.

It is an arithmetic number, because the mean of its divisors is an integer number (4788240).

Almost surely, 2^12768638 is an apocalyptic number.

12768638 is a deficient number, since it is larger than the sum of its proper divisors (6384322).

12768638 is an equidigital number, since it uses as much as digits as its factorization.

12768638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6384321.

The product of its digits is 96768, while the sum is 41.

The square root of 12768638 is about 3573.3231032192. The cubic root of 12768638 is about 233.7302148028.

The spelling of 12768638 in words is "twelve million, seven hundred sixty-eight thousand, six hundred thirty-eight".