4. In a charity donation event, a total of 72 people donated, and the total donation amount is a five-digit number, with the ten-thousands digit being 5, the hundreds digit being 3, the tens digit being 7, and the average donation amount per person is an integer. Therefore, the average donation per person is $\qquad$ yuan.

将上面的文本翻译成英文，请保留源文本的换行和格式，直接输出翻译结果。 

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Note: The last sentence is a repetition of the instruction and should not be included in the translated text. Here is the corrected version:

4. In a charity donation event, a total of 72 people donated, and the total donation amount is a five-digit number, with the ten-thousands digit being 5, the hundreds digit being 3, the tens digit being 7, and the average donation amount per person is an integer. Therefore, the average donation per person is $\qquad$ yuan.
$783$