Alright, let's work through 90619304 times 45403997 step by step
90619304 × 45403997 = 45403997 × (90619304)
+ 45403997 × 4 that equals 181615988
+ 45403997 × 00 that equals 0
+ 45403997 × 300 what gives us 13621199100
+ 45403997 × 9000 resulting in 408635973000
+ 45403997 × 10000 which equals 454039970000
+ 45403997 × 600000 resulting in 27242398200000
+ 45403997 × 0000000 that equals 0
+ 45403997 × 90000000 yielding 4086359730000000

= 4114478606958088
