6643744 has 24 divisors (see below), whose sum is σ = 13160448. Its totient is φ = 3301440.

The previous prime is 6643739. The next prime is 6643781. The reversal of 6643744 is 4473466.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5569 + ... + 6655.

It is an arithmetic number, because the mean of its divisors is an integer number (548352).

Almost surely, 2^6643744 is an apocalyptic number.

It is an amenable number.

6643744 is a deficient number, since it is larger than the sum of its proper divisors (6516704).

6643744 is a wasteful number, since it uses less digits than its factorization.

6643744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1288 (or 1280 counting only the distinct ones).

The product of its digits is 48384, while the sum is 34.

The square root of 6643744 is about 2577.5461198590. The cubic root of 6643744 is about 187.9912475177.

The spelling of 6643744 in words is "six million, six hundred forty-three thousand, seven hundred forty-four".