Alright, let's work through 42680839 times 12487663 step by step
42680839 × 12487663 = 12487663 × (42680839)
+ 12487663 × 9 yielding 112388967
+ 12487663 × 30 yielding 374629890
+ 12487663 × 800 what gives us 9990130400
+ 12487663 × 0000 that results in 0
+ 12487663 × 80000 giving us 999013040000
+ 12487663 × 600000 that results in 7492597800000
+ 12487663 × 2000000 that equals 24975326000000
+ 12487663 × 40000000 resulting in 499506520000000

= 532983933989257
