Alright, let's work through 7509708 times 91018131 step by step
7509708 × 91018131 = 91018131 × (7509708)
+ 91018131 × 8 what gives us 728145048
+ 91018131 × 00 that equals 0
+ 91018131 × 700 that equals 63712691700
+ 91018131 × 9000 resulting in 819163179000
+ 91018131 × 00000 that results in 0
+ 91018131 × 500000 that equals 45509065500000
+ 91018131 × 7000000 yielding 637126917000000

= 683519586515748
