Alright, let's work through 42087734 times 86488297 step by step
42087734 × 86488297 = 86488297 × (42087734)
+ 86488297 × 4 producing 345953188
+ 86488297 × 30 giving us 2594648910
+ 86488297 × 700 yielding 60541807900
+ 86488297 × 7000 producing 605418079000
+ 86488297 × 80000 resulting in 6919063760000
+ 86488297 × 000000 what gives us 0
+ 86488297 × 2000000 yielding 172976594000000
+ 86488297 × 40000000 that results in 3459531880000000

= 3640096438248998
