Alright, let's work through 90691557 times 41692787 step by step
90691557 × 41692787 = 41692787 × (90691557)
+ 41692787 × 7 which equals 291849509
+ 41692787 × 50 resulting in 2084639350
+ 41692787 × 500 that results in 20846393500
+ 41692787 × 1000 which equals 41692787000
+ 41692787 × 90000 that is equal 3752350830000
+ 41692787 × 600000 that is equal 25015672200000
+ 41692787 × 0000000 what gives us 0
+ 41692787 × 90000000 giving us 3752350830000000

= 3781183768699359
