Seventy Eight (78)
1. It is the smallest number which can be written as the sum of four distinct squares in 3 ways.
78 = 1^2 + 2^2 +3^2 + 8^2
= 1^2 + 4^2 + 5^2 + 6^2
= 2^2 + 3^2 + 4^2 + 7^2
2. It is a triangular number.
3. It is the sum of first 12 natural numbers.
1 + 2 + 3 + --- + 12 = 78
4. There are 78 Tarot cards which is used for fortune telling. 56 among them the cards of lesser arcana and 22 are of greater arcana.
5. It can be written as the sum of two consecutive primes.
78 = 37 + 41
6. It is a 27-gonal number.
7. It is divisible by three distinct prime number 2, 3 and 13 which makes it a member of Sphenic number. A Sphenic number is a positive integer having three distinct prime factors.
The first five Sphenic numbers are – 30, 42, 66, 70 and 78.
8. The atomic number of Platinum is 78.
9. The number of chromosomes in canine of DNA is 78.
10. It is an abundant number.
Rajesh Kumar Thakur
rkthakur1974@gmail.com
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