Alright, let's work through 64440953 times 42687647 step by step
64440953 × 42687647 = 42687647 × (64440953)
+ 42687647 × 3 that equals 128062941
+ 42687647 × 50 that equals 2134382350
+ 42687647 × 900 yielding 38418882300
+ 42687647 × 0000 resulting in 0
+ 42687647 × 40000 resulting in 1707505880000
+ 42687647 × 400000 producing 17075058800000
+ 42687647 × 4000000 resulting in 170750588000000
+ 42687647 × 60000000 what gives us 2561258820000000

= 2750832654007591
