Alright, let's work through 7877 times 636 step by step
7877 × 636 = 636 × (7877)
+ 636 × 7 that results in 4452
+ 636 × 70 that results in 44520
+ 636 × 800 which equals 508800
+ 636 × 7000 yielding 4452000

= 5009772
