6691688 has 16 divisors (see below), whose sum is σ = 12574500. Its totient is φ = 3338496.

The previous prime is 6691687. The next prime is 6691697. The reversal of 6691688 is 8861966.

It can be written as a sum of positive squares in 2 ways, for example, as 6666724 + 24964 = 2582^2 + 158^2 .

It is not an unprimeable number, because it can be changed into a prime (6691687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6128 + ... + 7136.

Almost surely, 2^6691688 is an apocalyptic number.

It is an amenable number.

6691688 is a deficient number, since it is larger than the sum of its proper divisors (5882812).

6691688 is a wasteful number, since it uses less digits than its factorization.

6691688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1844 (or 1840 counting only the distinct ones).

The product of its digits is 124416, while the sum is 44.

The square root of 6691688 is about 2586.8297199468. The cubic root of 6691688 is about 188.4423715746.

The spelling of 6691688 in words is "six million, six hundred ninety-one thousand, six hundred eighty-eight".