Alright, let's work through 5426 times 5781 step by step
5426 × 5781 = 5781 × (5426)
+ 5781 × 6 yielding 34686
+ 5781 × 20 resulting in 115620
+ 5781 × 400 that equals 2312400
+ 5781 × 5000 what gives us 28905000

= 31367706
