12216528 has 40 divisors (see below), whose sum is σ = 35067200. Its totient is φ = 4072032.

The previous prime is 12216499. The next prime is 12216539. The reversal of 12216528 is 82561221.

It is a happy number.

12216528 is a `hidden beast` number, since 1 + 2 + 2 + 1 + 652 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

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, 13708 + ... + 14571.

It is an arithmetic number, because the mean of its divisors is an integer number (876680).

Almost surely, 2^12216528 is an apocalyptic number.

12216528 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

12216528 is an abundant number, since it is smaller than the sum of its proper divisors (22850672).

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

12216528 is a wasteful number, since it uses less digits than its factorization.

12216528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28296 (or 28284 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

The square root of 12216528 is about 3495.2150148453. The cubic root of 12216528 is about 230.3116631840.

Adding to 12216528 its reverse (82561221), we get a palindrome (94777749).

The spelling of 12216528 in words is "twelve million, two hundred sixteen thousand, five hundred twenty-eight".