Alright, let's work through 9639 times 7072 step by step
9639 × 7072 = 7072 × (9639)
+ 7072 × 9 what gives us 63648
+ 7072 × 30 yielding 212160
+ 7072 × 600 yielding 4243200
+ 7072 × 9000 that results in 63648000

= 68167008
