Alright, let's work through 87090609 times 53492983 step by step
87090609 × 53492983 = 53492983 × (87090609)
+ 53492983 × 9 that is equal 481436847
+ 53492983 × 00 yielding 0
+ 53492983 × 600 that equals 32095789800
+ 53492983 × 0000 producing 0
+ 53492983 × 90000 that equals 4814368470000
+ 53492983 × 000000 what gives us 0
+ 53492983 × 7000000 which equals 374450881000000
+ 53492983 × 80000000 yielding 4279438640000000

= 4658736466696647
