6881668 has 18 divisors (see below), whose sum is σ = 12795146. Its totient is φ = 3237888.

The previous prime is 6881663. The next prime is 6881683. The reversal of 6881668 is 8661886.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 770884 + 6110784 = 878^2 + 2472^2 .

It is not an unprimeable number, because it can be changed into a prime (6881663) 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, 1821 + ... + 4132.

Almost surely, 2^6881668 is an apocalyptic number.

6881668 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

6881668 is a deficient number, since it is larger than the sum of its proper divisors (5913478).

6881668 is a wasteful number, since it uses less digits than its factorization.

6881668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5991 (or 5972 counting only the distinct ones).

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

The square root of 6881668 is about 2623.2933499706. The cubic root of 6881668 is about 190.2090773247.

The spelling of 6881668 in words is "six million, eight hundred eighty-one thousand, six hundred sixty-eight".