6624 has 36 divisors (see below), whose sum is σ = 19656. Its totient is φ = 2112.

The previous prime is 6619. The next prime is 6637. The reversal of 6624 is 4266.

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 Harshad number since it is a multiple of its sum of digits (18).

It is a nude number because it is divisible by every one of its digits and also a Zuckerman number because it is divisible by the product of its digits.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 6597 and 6606.

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.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 277 + ... + 299.

It is an arithmetic number, because the mean of its divisors is an integer number (546).

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).

6624 is an abundant number, since it is smaller than the sum of its proper divisors (13032).

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 sum of its prime factors is 39 (or 28 counting only the distinct ones).

The product of its digits is 288, while the sum is 18.

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).

It can be divided in two parts, 662 and 4, that added together give a palindrome (666).

The spelling of 6624 in words is "six thousand, six hundred twenty-four".