Alright, let's work through 85426331 times 86877389 step by step
85426331 × 86877389 = 86877389 × (85426331)
+ 86877389 × 1 which equals 86877389
+ 86877389 × 30 giving us 2606321670
+ 86877389 × 300 which equals 26063216700
+ 86877389 × 6000 which equals 521264334000
+ 86877389 × 20000 what gives us 1737547780000
+ 86877389 × 400000 that equals 34750955600000
+ 86877389 × 5000000 that equals 434386945000000
+ 86877389 × 80000000 which equals 6950191120000000

= 7421616589129759
