Alright, let's work through 64657388 times 61829700 step by step
64657388 × 61829700 = 61829700 × (64657388)
+ 61829700 × 8 resulting in 494637600
+ 61829700 × 80 what gives us 4946376000
+ 61829700 × 300 resulting in 18548910000
+ 61829700 × 7000 that results in 432807900000
+ 61829700 × 50000 yielding 3091485000000
+ 61829700 × 600000 that is equal 37097820000000
+ 61829700 × 4000000 that equals 247318800000000
+ 61829700 × 60000000 giving us 3709782000000000

= 3997746902823600
