6816664 has 16 divisors (see below), whose sum is σ = 12841920. Its totient is φ = 3392160.

The previous prime is 6816659. The next prime is 6816679. The reversal of 6816664 is 4666186.

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, 127 + ... + 3694.

It is an arithmetic number, because the mean of its divisors is an integer number (802620).

Almost surely, 2^6816664 is an apocalyptic number.

It is an amenable number.

6816664 is a deficient number, since it is larger than the sum of its proper divisors (6025256).

6816664 is a wasteful number, since it uses less digits than its factorization.

6816664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4050 (or 4046 counting only the distinct ones).

The product of its digits is 41472, while the sum is 37.

The square root of 6816664 is about 2610.8741831042. The cubic root of 6816664 is about 189.6082788198.

It can be divided in two parts, 6 and 816664, that multiplied together give a palindrome (4899984).

The spelling of 6816664 in words is "six million, eight hundred sixteen thousand, six hundred sixty-four".