Alright, let's work through 28004709 times 70715069 step by step
28004709 × 70715069 = 70715069 × (28004709)
+ 70715069 × 9 yielding 636435621
+ 70715069 × 00 that equals 0
+ 70715069 × 700 that results in 49500548300
+ 70715069 × 4000 producing 282860276000
+ 70715069 × 00000 that equals 0
+ 70715069 × 000000 giving us 0
+ 70715069 × 8000000 giving us 565720552000000
+ 70715069 × 20000000 giving us 1414301380000000

= 1980354929259921
