6624 is a `hidden beast` number, since 662 + 4 = 666.
It is a tau number, because it is divible by the number of its divisors (36).
It is a zygodrome in base 2.
It is a congruent number.
It is an unprimeable number.
6624 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
26624 is an apocalyptic number.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 6624, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9828).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
6624 is a wasteful number, since it uses less digits than its factorization.
6624 is an evil number, because the sum of its binary digits is even.
The square root of 6624 is about 81.3879597975. The cubic root of 6624 is about 18.7804837460.
Subtracting from 6624 its product of digits (288), we obtain a palindrome (6336).
The spelling of 6624 in words is "six thousand, six hundred twenty-four".