Alright, let's work through 71498945 times 17805705 step by step
71498945 × 17805705 = 17805705 × (71498945)
+ 17805705 × 5 what gives us 89028525
+ 17805705 × 40 giving us 712228200
+ 17805705 × 900 giving us 16025134500
+ 17805705 × 8000 which equals 142445640000
+ 17805705 × 90000 that equals 1602513450000
+ 17805705 × 400000 resulting in 7122282000000
+ 17805705 × 1000000 yielding 17805705000000
+ 17805705 × 70000000 yielding 1246399350000000

= 1273089122481225
