I am a prime number between 70 and 90. My tens digit is a multiple of 4. My digits total 17

Question

Can someone please answer my question in about 2 days. If you answer my question i will give you a shoutout on youtube. my account is ssggxo:). Just comment your account once you answer the question. If you dont have a youtube account i will give you a shoutout on social media eg.instagram, twitter, facebook etc. Just comment your account, social media and the answer.

 

This is a great help thanks

Answer 1

prime number=89

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Answer 2

89 is the only possibility & here's why: tens digit is 8 (2 times 4). Digits total 17 & 17 - 8 = 9!