Itself 9 which is an integer or a whole number but its factors are 1, 3 and 9
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An integer is the same thing as a whole number, so your question is misguided. Nine is an integer.
18 and -2
The least common factor of any set of integers is 1.
-10 and -11.
39
Example: Question: How many toes have you? Answer: At the last count, nine.