Alright, let's work through 87024731 times 3861135 step by step
87024731 × 3861135 = 3861135 × (87024731)
+ 3861135 × 1 what gives us 3861135
+ 3861135 × 30 that is equal 115834050
+ 3861135 × 700 which equals 2702794500
+ 3861135 × 4000 producing 15444540000
+ 3861135 × 20000 that results in 77222700000
+ 3861135 × 000000 yielding 0
+ 3861135 × 7000000 which equals 27027945000000
+ 3861135 × 80000000 giving us 308890800000000

= 336014234729685
