Alright, let's work through 13387231 times 38688081 step by step
13387231 × 38688081 = 38688081 × (13387231)
+ 38688081 × 1 that is equal 38688081
+ 38688081 × 30 producing 1160642430
+ 38688081 × 200 that is equal 7737616200
+ 38688081 × 7000 yielding 270816567000
+ 38688081 × 80000 yielding 3095046480000
+ 38688081 × 300000 that equals 11606424300000
+ 38688081 × 3000000 what gives us 116064243000000
+ 38688081 × 10000000 yielding 386880810000000

= 517926277293711
