Alright, let's work through 87427207 times 51864453 step by step
87427207 × 51864453 = 51864453 × (87427207)
+ 51864453 × 7 resulting in 363051171
+ 51864453 × 00 producing 0
+ 51864453 × 200 that equals 10372890600
+ 51864453 × 7000 that equals 363051171000
+ 51864453 × 20000 that results in 1037289060000
+ 51864453 × 400000 which equals 20745781200000
+ 51864453 × 7000000 that is equal 363051171000000
+ 51864453 × 80000000 that equals 4149156240000000

= 4534364268372771
