Alright, let's work through 87957382 times 53243921 step by step
87957382 × 53243921 = 53243921 × (87957382)
+ 53243921 × 2 which equals 106487842
+ 53243921 × 80 yielding 4259513680
+ 53243921 × 300 producing 15973176300
+ 53243921 × 7000 that results in 372707447000
+ 53243921 × 50000 yielding 2662196050000
+ 53243921 × 900000 resulting in 47919528900000
+ 53243921 × 7000000 what gives us 372707447000000
+ 53243921 × 80000000 that is equal 4259513680000000

= 4683195898574822
