Alright, let's work through 64107887 times 10726734 step by step
64107887 × 10726734 = 10726734 × (64107887)
+ 10726734 × 7 resulting in 75087138
+ 10726734 × 80 producing 858138720
+ 10726734 × 800 that equals 8581387200
+ 10726734 × 7000 that results in 75087138000
+ 10726734 × 00000 resulting in 0
+ 10726734 × 100000 yielding 1072673400000
+ 10726734 × 4000000 which equals 42906936000000
+ 10726734 × 60000000 that is equal 643604040000000

= 687668251151058
