6685686 has 64 divisors (see below), whose sum is σ = 17740800. Its totient is φ = 1824768.

The previous prime is 6685673. The next prime is 6685687. The reversal of 6685686 is 6865866.

6685686 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

Its product of digits (414720) is a multiple of the sum of its prime factors (810).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6685687) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8310 + ... + 9078.

It is an arithmetic number, because the mean of its divisors is an integer number (277200).

Almost surely, 2^6685686 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6685686, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8870400).

6685686 is an abundant number, since it is smaller than the sum of its proper divisors (11055114).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6685686 is a wasteful number, since it uses less digits than its factorization.

6685686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 810 (or 804 counting only the distinct ones).

The product of its digits is 414720, while the sum is 45.

The square root of 6685686 is about 2585.6693524115. The cubic root of 6685686 is about 188.3860146217.

The spelling of 6685686 in words is "six million, six hundred eighty-five thousand, six hundred eighty-six".