6643436 has 12 divisors (see below), whose sum is σ = 12027120. Its totient is φ = 3207120.

The previous prime is 6643423. The next prime is 6643453. The reversal of 6643436 is 6343466.

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, 28520 + ... + 28751.

It is an arithmetic number, because the mean of its divisors is an integer number (1002260).

Almost surely, 2^6643436 is an apocalyptic number.

It is an amenable number.

6643436 is a deficient number, since it is larger than the sum of its proper divisors (5383684).

6643436 is a wasteful number, since it uses less digits than its factorization.

6643436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57304 (or 57302 counting only the distinct ones).

The product of its digits is 31104, while the sum is 32.

The square root of 6643436 is about 2577.4863724179. The cubic root of 6643436 is about 187.9883424188.

The spelling of 6643436 in words is "six million, six hundred forty-three thousand, four hundred thirty-six".