6643212 has 12 divisors (see below), whose sum is σ = 15500856. Its totient is φ = 2214400.

The previous prime is 6643211. The next prime is 6643213. The reversal of 6643212 is 2123466.

It is an interprime number because it is at equal distance from previous prime (6643211) and next prime (6643213).

It is a tau number, because it is divible by the number of its divisors (12).

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

It is not an unprimeable number, because it can be changed into a prime (6643211) 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 3 ways as a sum of consecutive naturals, for example, 276789 + ... + 276812.

It is an arithmetic number, because the mean of its divisors is an integer number (1291738).

Almost surely, 2^6643212 is an apocalyptic number.

It is an amenable number.

6643212 is an abundant number, since it is smaller than the sum of its proper divisors (8857644).

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

6643212 is a wasteful number, since it uses less digits than its factorization.

6643212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 553608 (or 553606 counting only the distinct ones).

The product of its digits is 1728, while the sum is 24.

The square root of 6643212 is about 2577.4429188636. The cubic root of 6643212 is about 187.9862295633.

Adding to 6643212 its reverse (2123466), we get a palindrome (8766678).

The spelling of 6643212 in words is "six million, six hundred forty-three thousand, two hundred twelve".