No problem, we've got 27399 and 23465123 to multiply
27399 × 23465123 = 23465123 × (27399)
+ 23465123 × 9 which equals 211186107
+ 23465123 × 90 what gives us 2111861070
+ 23465123 × 300 resulting in 7039536900
+ 23465123 × 7000 giving us 164255861000
+ 23465123 × 20000 resulting in 469302460000

= 642920905077
