Any number without decimal places is an integer, including -87.
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87 is an integer and so there is no sensible way of writing it as a fraction or mixed number.
Just multiply 87 by any integer! For example, the result of each of the following calculations will give you a multiple of 87: 87 x 0 87 x 1 87 x 2 87 x 3 87 x 4 87 x (-1) 87 x (-2) etc.
The positive integer factors of 261 are: 1, 3, 9, 29, 87, 261
The positive integer factors of 348 are: 1, 2, 3, 4, 6, 12, 29, 58, 87, 116, 174, 348
No, it is an integer.