6684890 has 16 divisors (see below), whose sum is σ = 12260808. Its totient is φ = 2623296.

The previous prime is 6684869. The next prime is 6684907. The reversal of 6684890 is 984866.

It can be written as a sum of positive squares in 4 ways, for example, as 5726449 + 958441 = 2393^2 + 979^2 .

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5777 + ... + 6836.

Almost surely, 2^6684890 is an apocalyptic number.

6684890 is a deficient number, since it is larger than the sum of its proper divisors (5575918).

6684890 is a wasteful number, since it uses less digits than its factorization.

6684890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12673.

The product of its (nonzero) digits is 82944, while the sum is 41.

The square root of 6684890 is about 2585.5154225028. The cubic root of 6684890 is about 188.3785378911.

The spelling of 6684890 in words is "six million, six hundred eighty-four thousand, eight hundred ninety".