Alright, let's work through 72820223 times 89357235 step by step
72820223 × 89357235 = 89357235 × (72820223)
+ 89357235 × 3 that is equal 268071705
+ 89357235 × 20 that is equal 1787144700
+ 89357235 × 200 that equals 17871447000
+ 89357235 × 0000 that equals 0
+ 89357235 × 20000 that equals 1787144700000
+ 89357235 × 800000 that equals 71485788000000
+ 89357235 × 2000000 that equals 178714470000000
+ 89357235 × 70000000 yielding 6255006450000000

= 6507013779363405
