Alright, let's work through 90875109 times 35471621 step by step
90875109 × 35471621 = 35471621 × (90875109)
+ 35471621 × 9 giving us 319244589
+ 35471621 × 00 producing 0
+ 35471621 × 100 what gives us 3547162100
+ 35471621 × 5000 producing 177358105000
+ 35471621 × 70000 resulting in 2483013470000
+ 35471621 × 800000 producing 28377296800000
+ 35471621 × 0000000 which equals 0
+ 35471621 × 90000000 giving us 3192445890000000

= 3223487424781689
