Alright, let's work through 85373047 times 73230839 step by step
85373047 × 73230839 = 73230839 × (85373047)
+ 73230839 × 7 that results in 512615873
+ 73230839 × 40 that is equal 2929233560
+ 73230839 × 000 resulting in 0
+ 73230839 × 3000 yielding 219692517000
+ 73230839 × 70000 resulting in 5126158730000
+ 73230839 × 300000 that is equal 21969251700000
+ 73230839 × 5000000 that results in 366154195000000
+ 73230839 × 80000000 what gives us 5858467120000000

= 6251939859796433
