Alright, let's work through 87239265 times 41722871 step by step
87239265 × 41722871 = 41722871 × (87239265)
+ 41722871 × 5 that is equal 208614355
+ 41722871 × 60 giving us 2503372260
+ 41722871 × 200 giving us 8344574200
+ 41722871 × 9000 producing 375505839000
+ 41722871 × 30000 producing 1251686130000
+ 41722871 × 200000 what gives us 8344574200000
+ 41722871 × 7000000 that equals 292060097000000
+ 41722871 × 80000000 giving us 3337829680000000

= 3639872599729815
