12643228 has 36 divisors (see below), whose sum is σ = 24441480. Its totient is φ = 5718336.

The previous prime is 12643201. The next prime is 12643249. The reversal of 12643228 is 82234621.

12643228 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 12643196 and 12643205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39726 + ... + 40042.

It is an arithmetic number, because the mean of its divisors is an integer number (678930).

Almost surely, 2^12643228 is an apocalyptic number.

It is an amenable number.

12643228 is a deficient number, since it is larger than the sum of its proper divisors (11798252).

12643228 is a wasteful number, since it uses less digits than its factorization.

12643228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406 (or 391 counting only the distinct ones).

The product of its digits is 4608, while the sum is 28.

The square root of 12643228 is about 3555.7317109141. The cubic root of 12643228 is about 232.9624848268.

Adding to 12643228 its reverse (82234621), we get a palindrome (94877849).

The spelling of 12643228 in words is "twelve million, six hundred forty-three thousand, two hundred twenty-eight".