6643936 has 24 divisors (see below), whose sum is σ = 14087304. Its totient is φ = 3066240.

The previous prime is 6643919. The next prime is 6643969. The reversal of 6643936 is 6393466.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 6643895 and 6643904.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7570 + ... + 8401.

It is an arithmetic number, because the mean of its divisors is an integer number (586971).

Almost surely, 2^6643936 is an apocalyptic number.

It is an amenable number.

6643936 is an abundant number, since it is smaller than the sum of its proper divisors (7443368).

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

6643936 is a wasteful number, since it uses less digits than its factorization.

6643936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15994 (or 15986 counting only the distinct ones).

The product of its digits is 69984, while the sum is 37.

The square root of 6643936 is about 2577.5833643163. The cubic root of 6643936 is about 187.9930584430.

The spelling of 6643936 in words is "six million, six hundred forty-three thousand, nine hundred thirty-six".