Alright, let's work through 72581045 times 18578621 step by step
72581045 × 18578621 = 18578621 × (72581045)
+ 18578621 × 5 producing 92893105
+ 18578621 × 40 that is equal 743144840
+ 18578621 × 000 giving us 0
+ 18578621 × 1000 resulting in 18578621000
+ 18578621 × 80000 producing 1486289680000
+ 18578621 × 500000 resulting in 9289310500000
+ 18578621 × 2000000 producing 37157242000000
+ 18578621 × 70000000 that equals 1300503470000000

= 1348455726838945
