Alright, let's work through 90509003 times 75343501 step by step
90509003 × 75343501 = 75343501 × (90509003)
+ 75343501 × 3 which equals 226030503
+ 75343501 × 00 producing 0
+ 75343501 × 000 what gives us 0
+ 75343501 × 9000 what gives us 678091509000
+ 75343501 × 00000 which equals 0
+ 75343501 × 500000 what gives us 37671750500000
+ 75343501 × 0000000 what gives us 0
+ 75343501 × 90000000 producing 6780915090000000

= 6819265158039503
