Alright, let's work through 90495993 times 13742608 step by step
90495993 × 13742608 = 13742608 × (90495993)
+ 13742608 × 3 that is equal 41227824
+ 13742608 × 90 that is equal 1236834720
+ 13742608 × 900 that results in 12368347200
+ 13742608 × 5000 producing 68713040000
+ 13742608 × 90000 producing 1236834720000
+ 13742608 × 400000 what gives us 5497043200000
+ 13742608 × 0000000 that is equal 0
+ 13742608 × 90000000 giving us 1236834720000000

= 1243650957369744
