Alright, let's work through 71971830 times 86020108 step by step
71971830 × 86020108 = 86020108 × (71971830)
+ 86020108 × 0 which equals 0
+ 86020108 × 30 that is equal 2580603240
+ 86020108 × 800 giving us 68816086400
+ 86020108 × 1000 what gives us 86020108000
+ 86020108 × 70000 which equals 6021407560000
+ 86020108 × 900000 which equals 77418097200000
+ 86020108 × 1000000 giving us 86020108000000
+ 86020108 × 70000000 that is equal 6021407560000000

= 6191024589557640
