What is the next number -Math riddle

What is the next number in the series? 
7,645  5,764  4,576  ?

6,457 6,457

6,457

Explanation :  

The last digit is moved to the front to make the next number.
In this number series,
7,645 = 5,7645
similary, 
4,576 = 6,457

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