Alright, let's work through 87779976 times 5109197 step by step
87779976 × 5109197 = 5109197 × (87779976)
+ 5109197 × 6 what gives us 30655182
+ 5109197 × 70 which equals 357643790
+ 5109197 × 900 producing 4598277300
+ 5109197 × 9000 that results in 45982773000
+ 5109197 × 70000 what gives us 357643790000
+ 5109197 × 700000 what gives us 3576437900000
+ 5109197 × 7000000 yielding 35764379000000
+ 5109197 × 80000000 resulting in 408735760000000

= 448485190039272
