12216624 has 80 divisors (see below), whose sum is σ = 36521472. Its totient is φ = 3446784.

The previous prime is 12216619. The next prime is 12216643. The reversal of 12216624 is 42661221.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 12216594 and 12216603.

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 15 ways as a sum of consecutive naturals, for example, 34432 + ... + 34784.

Almost surely, 2^12216624 is an apocalyptic number.

12216624 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12216624, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18260736).

12216624 is an abundant number, since it is smaller than the sum of its proper divisors (24304848).

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

12216624 is a wasteful number, since it uses less digits than its factorization.

12216624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 474 (or 468 counting only the distinct ones).

The product of its digits is 1152, while the sum is 24.

The square root of 12216624 is about 3495.2287478790. The cubic root of 12216624 is about 230.3122664613.

Adding to 12216624 its reverse (42661221), we get a palindrome (54877845).

The spelling of 12216624 in words is "twelve million, two hundred sixteen thousand, six hundred twenty-four".