Alright, let's work through 84068407 times 72937987 step by step
84068407 × 72937987 = 72937987 × (84068407)
+ 72937987 × 7 which equals 510565909
+ 72937987 × 00 which equals 0
+ 72937987 × 400 that is equal 29175194800
+ 72937987 × 8000 that results in 583503896000
+ 72937987 × 60000 that is equal 4376279220000
+ 72937987 × 000000 what gives us 0
+ 72937987 × 4000000 which equals 291751948000000
+ 72937987 × 80000000 resulting in 5835038960000000

= 6131780376876709
