6688745 has 24 divisors (see below), whose sum is σ = 9751104. Its totient is φ = 4383456.

The previous prime is 6688727. The next prime is 6688757. The reversal of 6688745 is 5478866.

6688745 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 6688745 - 2²² = 2494441 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 6688696 and 6688705.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5042 + ... + 6228.

It is an arithmetic number, because the mean of its divisors is an integer number (406296).

Almost surely, 2^6688745 is an apocalyptic number.

It is an amenable number.

6688745 is a deficient number, since it is larger than the sum of its proper divisors (3062359).

6688745 is a wasteful number, since it uses less digits than its factorization.

6688745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1229 (or 1222 counting only the distinct ones).

The product of its digits is 322560, while the sum is 44.

The square root of 6688745 is about 2586.2608143805. The cubic root of 6688745 is about 188.4147419132.

The spelling of 6688745 in words is "six million, six hundred eighty-eight thousand, seven hundred forty-five".