28191

Names of 28191

• Cardinal: 28191 can be written as Twenty-eight thousand, one hundred ninety-one.

Scientific notation

• Scientific notation: 2.8191 × 10⁴

Factors of 28191

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 2
• Sum of prime factors: 9400

Divisors of 28191

• Number of divisors d(n): 4
• Complete list of divisors:
  1 3 9397 28191
• Sum of all divisors σ(n): 37592
• Sum of proper divisors (its aliquot sum) s(n): 9401
• 28191 is a deficient number, because the sum of its proper divisors (9401) is less than itself. Its deficiency is 18790

Bases of 28191

• Binary: 110111000011111₂
• Hexadecimal: 0x6E1F
• Base-36: LR3

Squares and roots of 28191

• 28191 squared (28191²) is 794732481
• 28191 cubed (28191³) is 22404303371871
• The square root of 28191 is 167.9017569891
• The cube root of 28191 is 30.4347795623

Scales and comparisons

• 28,191 seconds is equal to 7 hours, 49 minutes, 51 seconds.
• To count from 1 to 28,191 would take you about seven hours.

  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 28191 cubic inches would be around 2.5 feet tall.

Recreational maths with 28191

• 28191 backwards is 19182
• The number of decimal digits it has is: 5
• The sum of 28191's digits is 21
• More coming soon!