Alright, let's work through 83396376 times 10900040 step by step
83396376 × 10900040 = 10900040 × (83396376)
+ 10900040 × 6 that equals 65400240
+ 10900040 × 70 what gives us 763002800
+ 10900040 × 300 what gives us 3270012000
+ 10900040 × 6000 which equals 65400240000
+ 10900040 × 90000 producing 981003600000
+ 10900040 × 300000 that equals 3270012000000
+ 10900040 × 3000000 producing 32700120000000
+ 10900040 × 80000000 what gives us 872003200000000

= 909023834255040
