28420665

Names of 28420665

• Cardinal: 28420665 can be written as Twenty-eight million, four hundred twenty thousand, six hundred sixty-five.

Scientific notation

• Scientific notation: 2.8420665 × 10⁷

Factors of 28420665

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 6
• Sum of prime factors: 518

Divisors of 28420665

• Number of divisors d(n): 64
• Complete list of divisors:
  1 3 5 7 13 15 21 35 39 47 65 91 105 141 195 235 273 329 443 455 611 705 987 1329 1365 1645 1833 2215 3055 3101 4277 4935 5759 6645 9165 9303 12831 15505 17277 20821 21385 28795 40313 46515 62463 64155 86385 104105 120939 145747 201565 270673 312315 437241 604695 728735 812019 1353365 1894711 2186205 4060095 5684133 9473555 28420665
• Sum of all divisors σ(n): 57286656
• Sum of proper divisors (its aliquot sum) s(n): 28865991
• 28420665 is an abundant number, because the sum of its proper divisors (28865991) is greater than itself. Its abundance is 445326

Bases of 28420665

• Binary: 1101100011010101000111001₂
• Hexadecimal: 0x1B1AA39
• Base-36: GX5IX

Squares and roots of 28420665

• 28420665 squared (28420665²) is 807734199042225
• 28420665 cubed (28420665³) is 22956343080022397579625
• The square root of 28420665 is 5331.1035442955
• The cube root of 28420665 is 305.1720430421

Scales and comparisons

• 28,420,665 seconds is equal to 46 weeks, 6 days, 22 hours, 37 minutes, 45 seconds.
• To count from 1 to 28,420,665 would take you about eighteen weeks!

  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 28420665 cubic inches would be around 25.4 feet tall.

Recreational maths with 28420665

• 28420665 backwards is 56602482
• The number of decimal digits it has is: 8
• The sum of 28420665's digits is 33
• More coming soon!