Alright, let's work through 4000387 times 17861503 step by step
4000387 × 17861503 = 17861503 × (4000387)
+ 17861503 × 7 which equals 125030521
+ 17861503 × 80 which equals 1428920240
+ 17861503 × 300 giving us 5358450900
+ 17861503 × 0000 what gives us 0
+ 17861503 × 00000 that is equal 0
+ 17861503 × 000000 that equals 0
+ 17861503 × 4000000 that is equal 71446012000000

= 71452924401661
