6686890 has 16 divisors (see below), whose sum is σ = 13756032. Its totient is φ = 2292624.

The previous prime is 6686861. The next prime is 6686893. The reversal of 6686890 is 986866.

It is not an unprimeable number, because it can be changed into a prime (6686893) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47694 + ... + 47833.

It is an arithmetic number, because the mean of its divisors is an integer number (859752).

Almost surely, 2^6686890 is an apocalyptic number.

6686890 is an abundant number, since it is smaller than the sum of its proper divisors (7069142).

6686890 is a wasteful number, since it uses less digits than its factorization.

6686890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95541.

The product of its (nonzero) digits is 124416, while the sum is 43.

The square root of 6686890 is about 2585.9021636558. The cubic root of 6686890 is about 188.3973225188.

The spelling of 6686890 in words is "six million, six hundred eighty-six thousand, eight hundred ninety".