6643432 has 16 divisors (see below), whose sum is σ = 12484260. Its totient is φ = 3314304.

The previous prime is 6643423. The next prime is 6643453. The reversal of 6643432 is 2343466.

It can be written as a sum of positive squares in 2 ways, for example, as 6625476 + 17956 = 2574^2 + 134^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 6643432.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5508 + ... + 6604.

Almost surely, 2^6643432 is an apocalyptic number.

It is an amenable number.

6643432 is a deficient number, since it is larger than the sum of its proper divisors (5840828).

6643432 is a wasteful number, since it uses less digits than its factorization.

6643432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1860 (or 1856 counting only the distinct ones).

The product of its digits is 10368, while the sum is 28.

The square root of 6643432 is about 2577.4855964680. The cubic root of 6643432 is about 187.9883046897.

Adding to 6643432 its reverse (2343466), we get a palindrome (8986898).

It can be divided in two parts, 66434 and 32, that added together give a palindrome (66466).

The spelling of 6643432 in words is "six million, six hundred forty-three thousand, four hundred thirty-two".