6643768 has 32 divisors (see below), whose sum is σ = 13266000. Its totient is φ = 3110400.

The previous prime is 6643739. The next prime is 6643781. The reversal of 6643768 is 8673466.

It is a self number, because there is not a number n which added to its sum of digits gives 6643768.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16368 + ... + 16768.

Almost surely, 2^6643768 is an apocalyptic number.

It is an amenable number.

6643768 is a deficient number, since it is larger than the sum of its proper divisors (6622232).

6643768 is a wasteful number, since it uses less digits than its factorization.

6643768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 535 (or 531 counting only the distinct ones).

The product of its digits is 145152, while the sum is 40.

The square root of 6643768 is about 2577.5507754456. The cubic root of 6643768 is about 187.9914738853.

It can be divided in two parts, 66 and 43768, that added together give a palindrome (43834).

The spelling of 6643768 in words is "six million, six hundred forty-three thousand, seven hundred sixty-eight".