Alright, let's work through 83604399 times 93874421 step by step
83604399 × 93874421 = 93874421 × (83604399)
+ 93874421 × 9 that results in 844869789
+ 93874421 × 90 resulting in 8448697890
+ 93874421 × 300 that results in 28162326300
+ 93874421 × 4000 that results in 375497684000
+ 93874421 × 00000 which equals 0
+ 93874421 × 600000 producing 56324652600000
+ 93874421 × 3000000 producing 281623263000000
+ 93874421 × 80000000 that results in 7509953680000000

= 7848314549177979
