12644728 has 32 divisors (see below), whose sum is σ = 25578000. Its totient is φ = 5840640.

The previous prime is 12644707. The next prime is 12644741. The reversal of 12644728 is 82744621.

It is a happy number.

It is a Smith number, since the sum of its digits (34) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 12644693 and 12644702.

It is a congruent number.

It is an unprimeable number.

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, 5218 + ... + 7246.

Almost surely, 2^12644728 is an apocalyptic number.

It is an amenable number.

12644728 is an abundant number, since it is smaller than the sum of its proper divisors (12933272).

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

12644728 is a wasteful number, since it uses less digits than its factorization.

12644728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2095 (or 2091 counting only the distinct ones).

The product of its digits is 21504, while the sum is 34.

The square root of 12644728 is about 3555.9426317082. The cubic root of 12644728 is about 232.9716973979.

The spelling of 12644728 in words is "twelve million, six hundred forty-four thousand, seven hundred twenty-eight".