80

Names of 80

• Cardinal: 80 can be written as Eighty.

Scientific notation

• Scientific notation: 8 × 10¹

Factors of 80

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 5
• Sum of prime factors: 7

Divisors of 80

• Number of divisors d(n): 10
• Complete list of divisors:
  1 2 4 5 8 10 16 20 40 80
• Sum of all divisors σ(n): 186
• Sum of proper divisors (its aliquot sum) s(n): 106
• 80 is an abundant number, because the sum of its proper divisors (106) is greater than itself. Its abundance is 26

Bases of 80

• Binary: 1010000₂
• Hexadecimal: 0x50
• Base-36: 28

Squares and roots of 80

• 80 squared (80²) is 6400
• 80 cubed (80³) is 512000
• The square root of 80 is 8.9442719100
• The cube root of 80 is 4.3088693801

Scales and comparisons

• 80 seconds is equal to 1 minute, 20 seconds.
• To count from 1 to 80 would take you about forty seconds.

  This is a very rough estimate, based on a speaking rate of half a second every third order of magnitude. If you speak quickly, you could probably say any randomly-chosen number between one and a thousand in around half a second. Very big numbers obviously take longer to say, so we add half a second for every extra x1000. (We do not count involuntary pauses, bathroom breaks or the necessity of sleep in our calculation!)

• A cube with a volume of 80 cubic inches would be around 0.4 feet tall.

Recreational maths with 80

• 80 backwards is 08
• 80 is a Harshad number.
• The number of decimal digits it has is: 2
• The sum of 80's digits is 8
• More coming soon!