Alright, let's work through 42851387 times 85634840 step by step
42851387 × 85634840 = 85634840 × (42851387)
+ 85634840 × 7 giving us 599443880
+ 85634840 × 80 which equals 6850787200
+ 85634840 × 300 what gives us 25690452000
+ 85634840 × 1000 what gives us 85634840000
+ 85634840 × 50000 what gives us 4281742000000
+ 85634840 × 800000 resulting in 68507872000000
+ 85634840 × 2000000 that is equal 171269680000000
+ 85634840 × 40000000 producing 3425393600000000

= 3669571669523080
