Alright, let's work through 90006420 times 76450713 step by step
90006420 × 76450713 = 76450713 × (90006420)
+ 76450713 × 0 yielding 0
+ 76450713 × 20 producing 1529014260
+ 76450713 × 400 what gives us 30580285200
+ 76450713 × 6000 that results in 458704278000
+ 76450713 × 00000 which equals 0
+ 76450713 × 000000 producing 0
+ 76450713 × 0000000 producing 0
+ 76450713 × 90000000 giving us 6880564170000000

= 6881054983577460
