6681688 has 32 divisors (see below), whose sum is σ = 13829760. Its totient is φ = 3006720.

The previous prime is 6681683. The next prime is 6681721. The reversal of 6681688 is 8861866.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6681683) 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, 3481 + ... + 5047.

It is an arithmetic number, because the mean of its divisors is an integer number (432180).

Almost surely, 2^6681688 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6681688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6914880).

6681688 is an abundant number, since it is smaller than the sum of its proper divisors (7148072).

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

6681688 is a wasteful number, since it uses less digits than its factorization.

6681688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1627 (or 1623 counting only the distinct ones).

The product of its digits is 110592, while the sum is 43.

The square root of 6681688 is about 2584.8961294412. The cubic root of 6681688 is about 188.3484558997.

It can be divided in two parts, 668168 and 8, that multiplied together give a square (5345344 = 2312²).

The spelling of 6681688 in words is "six million, six hundred eighty-one thousand, six hundred eighty-eight".