Alright, let's work through 42278729 times 90491387 step by step
42278729 × 90491387 = 90491387 × (42278729)
+ 90491387 × 9 giving us 814422483
+ 90491387 × 20 which equals 1809827740
+ 90491387 × 700 that results in 63343970900
+ 90491387 × 8000 resulting in 723931096000
+ 90491387 × 70000 that results in 6334397090000
+ 90491387 × 200000 yielding 18098277400000
+ 90491387 × 2000000 that is equal 180982774000000
+ 90491387 × 40000000 yielding 3619655480000000

= 3825860827807123
