12724228 has 24 divisors (see below), whose sum is σ = 25722144. Its totient is φ = 5443200.

The previous prime is 12724223. The next prime is 12724249. The reversal of 12724228 is 82242721.

It is a junction number, because it is equal to n+sod(n) for n = 12724196 and 12724205.

It is not an unprimeable number, because it can be changed into a prime (12724223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7758 + ... + 9253.

It is an arithmetic number, because the mean of its divisors is an integer number (1071756).

Almost surely, 2^12724228 is an apocalyptic number.

It is an amenable number.

12724228 is an abundant number, since it is smaller than the sum of its proper divisors (12997916).

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

12724228 is a wasteful number, since it uses less digits than its factorization.

12724228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17043 (or 17041 counting only the distinct ones).

The product of its digits is 3584, while the sum is 28.

The square root of 12724228 is about 3567.1035869456. The cubic root of 12724228 is about 233.4589246788.

Adding to 12724228 its reverse (82242721), we get a palindrome (94966949).

The spelling of 12724228 in words is "twelve million, seven hundred twenty-four thousand, two hundred twenty-eight".