Alright, let's work through 7972 times 8639 step by step
7972 × 8639 = 8639 × (7972)
+ 8639 × 2 that results in 17278
+ 8639 × 70 that results in 604730
+ 8639 × 900 resulting in 7775100
+ 8639 × 7000 which equals 60473000

= 68870108
