Alright, let's work through 10240379 times 39065488 step by step
10240379 × 39065488 = 39065488 × (10240379)
+ 39065488 × 9 producing 351589392
+ 39065488 × 70 that is equal 2734584160
+ 39065488 × 300 producing 11719646400
+ 39065488 × 0000 that is equal 0
+ 39065488 × 40000 which equals 1562619520000
+ 39065488 × 200000 that results in 7813097600000
+ 39065488 × 0000000 that results in 0
+ 39065488 × 10000000 yielding 390654880000000

= 400045402939952
