Alright, let's work through 71700061 times 81300458 step by step
71700061 × 81300458 = 81300458 × (71700061)
+ 81300458 × 1 what gives us 81300458
+ 81300458 × 60 what gives us 4878027480
+ 81300458 × 000 yielding 0
+ 81300458 × 0000 yielding 0
+ 81300458 × 00000 yielding 0
+ 81300458 × 700000 which equals 56910320600000
+ 81300458 × 1000000 giving us 81300458000000
+ 81300458 × 70000000 what gives us 5691032060000000

= 5829247797927938
