Alright, let's work through 86373485 times 42924872 step by step
86373485 × 42924872 = 42924872 × (86373485)
+ 42924872 × 5 that is equal 214624360
+ 42924872 × 80 that results in 3433989760
+ 42924872 × 400 yielding 17169948800
+ 42924872 × 3000 resulting in 128774616000
+ 42924872 × 70000 that is equal 3004741040000
+ 42924872 × 300000 that equals 12877461600000
+ 42924872 × 6000000 giving us 257549232000000
+ 42924872 × 80000000 resulting in 3433989760000000

= 3707570787818920
