It is known that the dividend is 809, the quotient is 28, and the remainder is 25. What is the divisor?
已知被除数是809，商是28，余数是25，除数是多少？
<gadget id="calculator">809 - 25</gadget>
<output>784</output>

<gadget id="calculator">784 / 28</gadget>
<output>28</output>

<result>28</result>