Alright, let's work through 85620994 times 90293978 step by step
85620994 × 90293978 = 90293978 × (85620994)
+ 90293978 × 4 that is equal 361175912
+ 90293978 × 90 resulting in 8126458020
+ 90293978 × 900 yielding 81264580200
+ 90293978 × 0000 producing 0
+ 90293978 × 20000 yielding 1805879560000
+ 90293978 × 600000 that results in 54176386800000
+ 90293978 × 5000000 resulting in 451469890000000
+ 90293978 × 80000000 resulting in 7223518240000000

= 7731060148574132
