Alright, let's work through 8602830 times 78579407 step by step
8602830 × 78579407 = 78579407 × (8602830)
+ 78579407 × 0 that is equal 0
+ 78579407 × 30 yielding 2357382210
+ 78579407 × 800 giving us 62863525600
+ 78579407 × 2000 yielding 157158814000
+ 78579407 × 00000 resulting in 0
+ 78579407 × 600000 which equals 47147644200000
+ 78579407 × 8000000 that is equal 628635256000000

= 676005279921810
