6686216 has 24 divisors (see below), whose sum is σ = 12828270. Its totient is φ = 3266496.

The previous prime is 6686213. The next prime is 6686221. The reversal of 6686216 is 6126866.

It can be written as a sum of positive squares in only one way, i.e., 5541316 + 1144900 = 2354^2 + 1070^2 .

It is not an unprimeable number, because it can be changed into a prime (6686213) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 62435 + ... + 62541.

Almost surely, 2^6686216 is an apocalyptic number.

It is an amenable number.

6686216 is a deficient number, since it is larger than the sum of its proper divisors (6142054).

6686216 is a wasteful number, since it uses less digits than its factorization.

6686216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293 (or 182 counting only the distinct ones).

The product of its digits is 20736, while the sum is 35.

The square root of 6686216 is about 2585.7718383492. The cubic root of 6686216 is about 188.3909925178.

The spelling of 6686216 in words is "six million, six hundred eighty-six thousand, two hundred sixteen".