12217028 has 12 divisors (see below), whose sum is σ = 21415212. Its totient is φ = 6098400.

The previous prime is 12217027. The next prime is 12217097. The reversal of 12217028 is 82071221.

12217028 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 11710084 + 506944 = 3422^2 + 712^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12216994 and 12217012.

It is not an unprimeable number, because it can be changed into a prime (12217027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 626 + ... + 4982.

It is an arithmetic number, because the mean of its divisors is an integer number (1784601).

Almost surely, 2^12217028 is an apocalyptic number.

It is an amenable number.

12217028 is a deficient number, since it is larger than the sum of its proper divisors (9198184).

12217028 is a wasteful number, since it uses less digits than its factorization.

12217028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5062 (or 5060 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 12217028 is about 3495.2865404713. The cubic root of 12217028 is about 230.3148052186.

Adding to 12217028 its reverse (82071221), we get a palindrome (94288249).

The spelling of 12217028 in words is "twelve million, two hundred seventeen thousand, twenty-eight".