-61
Considering only natural numbers, besides the obvious 1 x 671, the only combination of two numbers that multiplies into 671 is 11 x 61 (or 61 x 11, of course).
1 x 244, 2 x 122, 4 x 61, 61 x 4, 122 x 2, 244 x 1.
2,6
61
3 and 8 make 24 when multiplied
1 and 1174 2 and 587
25
105
To find 61 percent of something, multiply the amount by .61
3
-52