6643312 has 60 divisors (see below), whose sum is σ = 14955640. Its totient is φ = 2833920.

The previous prime is 6643303. The next prime is 6643319. The reversal of 6643312 is 2133466.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6643319) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 162012 + ... + 162052.

Almost surely, 2^6643312 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 6643312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7477820).

6643312 is an abundant number, since it is smaller than the sum of its proper divisors (8312328).

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

6643312 is a wasteful number, since it uses less digits than its factorization.

6643312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122 (or 75 counting only the distinct ones).

The product of its digits is 2592, while the sum is 25.

The square root of 6643312 is about 2577.4623178623. The cubic root of 6643312 is about 187.9871728082.

Adding to 6643312 its reverse (2133466), we get a palindrome (8776778).

The spelling of 6643312 in words is "six million, six hundred forty-three thousand, three hundred twelve".