Alright, let's work through 65238891 times 7999804 step by step
65238891 × 7999804 = 7999804 × (65238891)
+ 7999804 × 1 giving us 7999804
+ 7999804 × 90 yielding 719982360
+ 7999804 × 800 that results in 6399843200
+ 7999804 × 8000 that results in 63998432000
+ 7999804 × 30000 that results in 239994120000
+ 7999804 × 200000 producing 1599960800000
+ 7999804 × 5000000 what gives us 39999020000000
+ 7999804 × 60000000 what gives us 479988240000000

= 521898341177364
