Alright, let's work through 5425887 times 12837920 step by step
5425887 × 12837920 = 12837920 × (5425887)
+ 12837920 × 7 that is equal 89865440
+ 12837920 × 80 what gives us 1027033600
+ 12837920 × 800 which equals 10270336000
+ 12837920 × 5000 that is equal 64189600000
+ 12837920 × 20000 that results in 256758400000
+ 12837920 × 400000 which equals 5135168000000
+ 12837920 × 5000000 that equals 64189600000000

= 69657103235040
