Alright, let's work through 87107789 times 40904886 step by step
87107789 × 40904886 = 40904886 × (87107789)
+ 40904886 × 9 that results in 368143974
+ 40904886 × 80 giving us 3272390880
+ 40904886 × 700 which equals 28633420200
+ 40904886 × 7000 that is equal 286334202000
+ 40904886 × 00000 what gives us 0
+ 40904886 × 100000 producing 4090488600000
+ 40904886 × 7000000 which equals 286334202000000
+ 40904886 × 80000000 that equals 3272390880000000

= 3563134178757054
