Importance of Number 27

Twenty seven (27)
1. It is the smallest two digit number in which the sum of digits is equal to the sum of prime factors.

27 = 3 x 3 x 3 and 2 + 7 = 3 + 3 + 3

2. It is the largest number which is equal to the sum of the digits of its cube.
27^3 = 19683 and 1 + 9 + 6 + 8 + 3 = 27

3. It is the magic constant of the multiple of 1/7.

1/7 = 0. 142857… 2/7 = 0.285714-- 3/7 = 0.428571-- 4/7 = 0.571428-- 5/6 = 0.714285-- 6/7 = 0.857142--

Digit 1 4 2 8 5 7 Digit Sum
1 1 4 2 8 5 7 27
2 2 8 5 7 1 4 27
3 4 2 8 5 7 1 27
4 5 7 1 4 2 8 27
5 7 1 4 2 8 5 27
6 8 5 7 1 4 2 27
Column sum 27 27 27 27 27 27

4. It is the third decagonal number. A decagonal number represents a decagon. The nth decagonal number is given by the formula--

5. It is a cubic number.
27 = 3 x 3 x 3

6. It is the only positive integer that is 3 times the sum of its digits.
27 = 3 x (2 + 7)

7. In Hindu astrology there are 27 nakshatra (stars) each controls a section of the zodiac signs.

The first few are – Ashwini, Bharani, Kritika –

8. If you add up all the digits from 2 to 7 it will give you 27. It is the second two digit number besides 15 with this property.
2 + 3 + 4 + 5 + 6 + 7 = 27

9. The atomic number of Cobalt is 27.

10. The atomic weight of Aluminum is 27.

11. It is the first odd perfect cube apart from 1.

12. It is the smallest number that can be expressed as the sum of 3 squares in 2 ways.
27 = 3^2 + 3^2 + 3^2 27 = 5^2 + 1^2 + 1^2

13. There are 27 cubes in a Rubik’s


14. It can be portioned in 3010 ways.

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Dr Rajesh Kumar Thakur
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