Alright, let's work through 8989791 times 72717320 step by step
8989791 × 72717320 = 72717320 × (8989791)
+ 72717320 × 1 yielding 72717320
+ 72717320 × 90 that is equal 6544558800
+ 72717320 × 700 which equals 50902124000
+ 72717320 × 9000 giving us 654455880000
+ 72717320 × 80000 that is equal 5817385600000
+ 72717320 × 900000 giving us 65445588000000
+ 72717320 × 8000000 what gives us 581738560000000

= 653713508880120
