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Math problem: help



Hello math folks,

        My son has a math problem, which I can not figure 
out yet, and I would be grateful for your help. The problem 
is: 

"Find the largest seven-digit number (say X), where X is 
divisible to every digit. Note that the seven digits are 
unique (no repetition.)"


	Thank you in advance for your help.

	Tuan