6689920 has 32 divisors (see below), whose sum is σ = 15994620. Its totient is φ = 2675712.

The previous prime is 6689909. The next prime is 6689971. The reversal of 6689920 is 299866.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 6270016 + 419904 = 2504^2 + 648^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 4587 + ... + 5866.

Almost surely, 2^6689920 is an apocalyptic number.

It is an amenable number.

6689920 is an abundant number, since it is smaller than the sum of its proper divisors (9304700).

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

6689920 is a wasteful number, since it uses less digits than its factorization.

6689920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10472 (or 10460 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 6689920 is about 2586.4879663358. The cubic root of 6689920 is about 188.4257740953.

The spelling of 6689920 in words is "six million, six hundred eighty-nine thousand, nine hundred twenty".