6643000 has 128 divisors (see below), whose sum is σ = 19393920. Its totient is φ = 2073600.

The previous prime is 6642997. The next prime is 6643019. The reversal of 6643000 is 3466.

It is a happy number.

6643000 is nontrivially palindromic in base 9.

6643000 is digitally balanced in base 8, because in such base it contains all the possibile digits an equal number of times.

6643000 is strictly pandigital in base 8.

It is a nialpdrome in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 90964 + ... + 91036.

It is an arithmetic number, because the mean of its divisors is an integer number (151515).

Almost surely, 2^6643000 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 6643000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9696960).

6643000 is an abundant number, since it is smaller than the sum of its proper divisors (12750920).

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

6643000 is a wasteful number, since it uses less digits than its factorization.

6643000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114 (or 100 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 6643000 is about 2577.4017925035. The cubic root of 6643000 is about 187.9842298527.

Adding to 6643000 its reverse (3466), we get a palindrome (6646466).

The spelling of 6643000 in words is "six million, six hundred forty-three thousand".