Alright, let's work through 90381645 times 13506668 step by step
90381645 × 13506668 = 13506668 × (90381645)
+ 13506668 × 5 that results in 67533340
+ 13506668 × 40 resulting in 540266720
+ 13506668 × 600 giving us 8104000800
+ 13506668 × 1000 producing 13506668000
+ 13506668 × 80000 yielding 1080533440000
+ 13506668 × 300000 that results in 4052000400000
+ 13506668 × 0000000 yielding 0
+ 13506668 × 90000000 resulting in 1215600120000000

= 1220754872308860
