Alright, let's work through 18109531 times 72104080 step by step
18109531 × 72104080 = 72104080 × (18109531)
+ 72104080 × 1 that results in 72104080
+ 72104080 × 30 what gives us 2163122400
+ 72104080 × 500 yielding 36052040000
+ 72104080 × 9000 that equals 648936720000
+ 72104080 × 00000 that equals 0
+ 72104080 × 100000 which equals 7210408000000
+ 72104080 × 8000000 that results in 576832640000000
+ 72104080 × 10000000 what gives us 721040800000000

= 1305771071986480
