Alright, let's work through 7842585 times 89038999 step by step
7842585 × 89038999 = 89038999 × (7842585)
+ 89038999 × 5 yielding 445194995
+ 89038999 × 80 producing 7123119920
+ 89038999 × 500 that results in 44519499500
+ 89038999 × 2000 what gives us 178077998000
+ 89038999 × 40000 yielding 3561559960000
+ 89038999 × 800000 resulting in 71231199200000
+ 89038999 × 7000000 that results in 623272993000000

= 698295917972415
