Alright, let's work through 86052408 times 85725139 step by step
86052408 × 85725139 = 85725139 × (86052408)
+ 85725139 × 8 producing 685801112
+ 85725139 × 00 giving us 0
+ 85725139 × 400 resulting in 34290055600
+ 85725139 × 2000 giving us 171450278000
+ 85725139 × 50000 which equals 4286256950000
+ 85725139 × 000000 yielding 0
+ 85725139 × 6000000 resulting in 514350834000000
+ 85725139 × 80000000 which equals 6858011120000000

= 7376854637084712
