6688289 has 4 divisors (see below), whose sum is σ = 6851460. Its totient is φ = 6525120.

The previous prime is 6688273. The next prime is 6688301. The reversal of 6688289 is 9828866.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 846400 + 5841889 = 920^2 + 2417^2 .

It is a cyclic number.

It is not a de Polignac number, because 6688289 - 2⁴ = 6688273 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6688789) 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, 81524 + ... + 81605.

It is an arithmetic number, because the mean of its divisors is an integer number (1712865).

Almost surely, 2^6688289 is an apocalyptic number.

It is an amenable number.

6688289 is a deficient number, since it is larger than the sum of its proper divisors (163171).

6688289 is a wasteful number, since it uses less digits than its factorization.

6688289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163170.

The product of its digits is 331776, while the sum is 47.

The square root of 6688289 is about 2586.1726547158. The cubic root of 6688289 is about 188.4104601396.

The spelling of 6688289 in words is "six million, six hundred eighty-eight thousand, two hundred eighty-nine".