75

Names of 75

• Cardinal: 75 can be written as Seventy-five.

Scientific notation

• Scientific notation: 7.5 × 10¹

Factors of 75

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 3
• Sum of prime factors: 8

Divisors of 75

• Number of divisors d(n): 6
• Complete list of divisors:
  1 3 5 15 25 75
• Sum of all divisors σ(n): 124
• Sum of proper divisors (its aliquot sum) s(n): 49
• 75 is a deficient number, because the sum of its proper divisors (49) is less than itself. Its deficiency is 26

Bases of 75

• Binary: 1001011₂
• Hexadecimal: 0x4B
• Base-36: 23

Squares and roots of 75

• 75 squared (75²) is 5625
• 75 cubed (75³) is 421875
• The square root of 75 is 8.6602540379
• The cube root of 75 is 4.2171633265

Scales and comparisons

• 75 seconds is equal to 1 minute, 15 seconds.
• To count from 1 to 75 would take you about thirty-seven 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 75 cubic inches would be around 0.4 feet tall.

Recreational maths with 75

• 75 backwards is 57
• The number of decimal digits it has is: 2
• The sum of 75's digits is 12
• More coming soon!