Alright, let's work through 80987747 times 50836771 step by step
80987747 × 50836771 = 50836771 × (80987747)
+ 50836771 × 7 giving us 355857397
+ 50836771 × 40 yielding 2033470840
+ 50836771 × 700 resulting in 35585739700
+ 50836771 × 7000 resulting in 355857397000
+ 50836771 × 80000 resulting in 4066941680000
+ 50836771 × 900000 that results in 45753093900000
+ 50836771 × 0000000 that is equal 0
+ 50836771 × 80000000 which equals 4066941680000000

= 4117155548044937
