6689680 has 20 divisors (see below), whose sum is σ = 15553692. Its totient is φ = 2675840.

The previous prime is 6689659. The next prime is 6689681. The reversal of 6689680 is 869866.

It can be written as a sum of positive squares in 2 ways, for example, as 5161984 + 1527696 = 2272^2 + 1236^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6689681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41731 + ... + 41890.

Almost surely, 2^6689680 is an apocalyptic number.

It is an amenable number.

6689680 is an abundant number, since it is smaller than the sum of its proper divisors (8864012).

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

6689680 is a wasteful number, since it uses less digits than its factorization.

6689680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83634 (or 83628 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 43.

The square root of 6689680 is about 2586.4415709619. The cubic root of 6689680 is about 188.4235208184.

The spelling of 6689680 in words is "six million, six hundred eighty-nine thousand, six hundred eighty".