Eighty (80)
1. It is the product of 5 primes.
80 = 2 x 2 x 2 x 2 x 5
2. It is a semi perfect number. There are several divisors of 80 –1, 2, 4, 5, 8, 10, 16, 20, 40 and 80.
Adding some of the divisors we get 80 making it a semi perfect number.
80 = 1 + 4 + 5 + 10 + 20 + 40
3. It is the smallest number with the property that n and n+1 are both product of 4 or more primes.
80 = 2 x 2 x 2 x 2 x 5
81 = 3 x 3 x 3 x 3
4. It can be expressed as the sum of two primes in 4 distinct ways.
80 = 7 + 73 = 13 + 67 = 19 + 61 = 37 + 43
5. It is an abundant number.
6. It is a Harshad number.
7. The atomic number of Mercury is 80.
Dr Rajesh Kumar Thakur
rkthakur1974@gmail.com
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