179

This number is a prime.

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Day 179 of a non-leap year (June 28), is a very special day for math enthusiasts! It is celebrated as "Perfect Number Day" because both 6 and 28 are perfect numbers and also as "Tau Day" because the date (6/28) approximates the value of τ = 6.28... , which is twice the value of π. [Gudipati]