12216028 has 12 divisors (see below), whose sum is σ = 23321592. Its totient is φ = 5552720.

The previous prime is 12215971. The next prime is 12216037. The reversal of 12216028 is 82061221.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138775 + ... + 138862.

It is an arithmetic number, because the mean of its divisors is an integer number (1943466).

Almost surely, 2^12216028 is an apocalyptic number.

It is an amenable number.

12216028 is a deficient number, since it is larger than the sum of its proper divisors (11105564).

12216028 is a wasteful number, since it uses less digits than its factorization.

12216028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277652 (or 277650 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 12216028 is about 3495.1434877555. The cubic root of 12216028 is about 230.3085210637.

Adding to 12216028 its reverse (82061221), we get a palindrome (94277249).

The spelling of 12216028 in words is "twelve million, two hundred sixteen thousand, twenty-eight".