Alright, let's work through 99472439 times 64213199 step by step
99472439 × 64213199 = 64213199 × (99472439)
+ 64213199 × 9 what gives us 577918791
+ 64213199 × 30 that is equal 1926395970
+ 64213199 × 400 which equals 25685279600
+ 64213199 × 2000 yielding 128426398000
+ 64213199 × 70000 that results in 4494923930000
+ 64213199 × 400000 which equals 25685279600000
+ 64213199 × 9000000 which equals 577918791000000
+ 64213199 × 90000000 that results in 5779187910000000

= 6387443520522361
