132
-1
if you multiply them it adds up to 516
Assuming that "adds up to" means "its digits add up to" 888
The factor pairs of 123 are (123,1)(41,3) Even considering their negative counterparts, nothing adds up to -24
132
-27
29
How about: 2 and 8
18 and 18
-408
-1
45
624
-13
if you multiply them it adds up to 516
24 and 5