Alright, let's work through 87619349 times 72059621 step by step
87619349 × 72059621 = 72059621 × (87619349)
+ 72059621 × 9 that results in 648536589
+ 72059621 × 40 which equals 2882384840
+ 72059621 × 300 resulting in 21617886300
+ 72059621 × 9000 which equals 648536589000
+ 72059621 × 10000 what gives us 720596210000
+ 72059621 × 600000 resulting in 43235772600000
+ 72059621 × 7000000 yielding 504417347000000
+ 72059621 × 80000000 what gives us 5764769680000000

= 6313817081206729
