# Number 30. Facts about the number thirty (math facts and fun facts).

**Here are some math facts about the number 30:**

The number 30 is an even number – the 15th even number.

The number 30 has 8 factors which are 1, 2, 3, 5, 6, 10,15 and 30.

Also the prime factors of 30 are 2, 3 and 5. The prime factor decomposition of 30 is 2 × 3 × 5. Therefore, it also known as a “sphenic number” as it can be written as a product of three distinct prime factors.

The square of 30 is 900 and the square root of 30 is 5.5 (rounded to 1 decimal place)

30% as a fraction is 3/10 or 0.3 as a decimal.

In the binary number system 30 can be written as 11110.

In the hexadecimal number system 30 can be written as 1E.

In Roman Numerals the number 30 can be written as XXX

**Popular conversions involving the number 30:**

If you travelled a distance of 30 kilometers then this would be equivalent to 18.6 miles.

Also a length of 30 meters is equivalent to 98.4 feet.

A weight of 30 kilograms is equivalent to 66.1 pounds.

A temperature of 30 degrees Celsius is 86 degrees Fahrenheit.

In a year there are 4 months which have 30 days; September, April, June and November.

**More non-math facts about the number 30:**

In geometry, a 30 sided polygon is triacontagon

In music, “30 minutes” is a song by t.A.T.u. Also, “30 – seconds until the end of the world” is a song by Pennywise.

In cinema, “30 Days of Night” is an American horror film made in 2007.

In chemistry, the atomic number of Zinc is 30.

30 years of marriage is known as a pearl wedding anniversary.

In the game of Bingo, the ball 30 is known as “Dirty Gertie, Blind 30”

The war from 1618 to 1648 is known as the thirty year war.

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