6688945 has 16 divisors (see below), whose sum is σ = 8362368. Its totient is φ = 5132160.

The previous prime is 6688943. The next prime is 6688967. The reversal of 6688945 is 5498866.

It is not a de Polignac number, because 6688945 - 2¹ = 6688943 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6688895 and 6688904.

It is not an unprimeable number, because it can be changed into a prime (6688943) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13492 + ... + 13978.

It is an arithmetic number, because the mean of its divisors is an integer number (522648).

Almost surely, 2^6688945 is an apocalyptic number.

It is an amenable number.

6688945 is a deficient number, since it is larger than the sum of its proper divisors (1673423).

6688945 is a wasteful number, since it uses less digits than its factorization.

6688945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 600.

The product of its digits is 414720, while the sum is 46.

The square root of 6688945 is about 2586.2994799520. The cubic root of 6688945 is about 188.4166198226.

The spelling of 6688945 in words is "six million, six hundred eighty-eight thousand, nine hundred forty-five".