6643332 has 36 divisors (see below), whose sum is σ = 16956940. Its totient is φ = 2192832.

The previous prime is 6643321. The next prime is 6643333. The reversal of 6643332 is 2333466.

It can be written as a sum of positive squares in 2 ways, for example, as 3594816 + 3048516 = 1896^2 + 1746^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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

It is an Ulam number.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 6643296 and 6643305.

It is not an unprimeable number, because it can be changed into a prime (6643333) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 3078 + ... + 4770.

Almost surely, 2^6643332 is an apocalyptic number.

It is an amenable number.

6643332 is an abundant number, since it is smaller than the sum of its proper divisors (10313608).

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

6643332 is a wasteful number, since it uses less digits than its factorization.

6643332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1812 (or 1807 counting only the distinct ones).

The product of its digits is 7776, while the sum is 27.

The square root of 6643332 is about 2577.4661976445. The cubic root of 6643332 is about 187.9873614561.

Adding to 6643332 its reverse (2333466), we get a palindrome (8976798).

The spelling of 6643332 in words is "six million, six hundred forty-three thousand, three hundred thirty-two".