Alright, let's work through 83406397 times 52540880 step by step
83406397 × 52540880 = 52540880 × (83406397)
+ 52540880 × 7 that is equal 367786160
+ 52540880 × 90 resulting in 4728679200
+ 52540880 × 300 giving us 15762264000
+ 52540880 × 6000 yielding 315245280000
+ 52540880 × 00000 that results in 0
+ 52540880 × 400000 that equals 21016352000000
+ 52540880 × 3000000 resulting in 157622640000000
+ 52540880 × 80000000 that equals 4203270400000000

= 4382245496009360
