6643814 has 8 divisors (see below), whose sum is σ = 10016400. Its totient is φ = 3305016.

The previous prime is 6643811. The next prime is 6643823. The reversal of 6643814 is 4183466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6643811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7949 + ... + 8744.

It is an arithmetic number, because the mean of its divisors is an integer number (1252050).

Almost surely, 2^6643814 is an apocalyptic number.

6643814 is a deficient number, since it is larger than the sum of its proper divisors (3372586).

6643814 is a wasteful number, since it uses less digits than its factorization.

6643814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16894.

The product of its digits is 13824, while the sum is 32.

The square root of 6643814 is about 2577.5596986297. The cubic root of 6643814 is about 187.9919077549.

The spelling of 6643814 in words is "six million, six hundred forty-three thousand, eight hundred fourteen".