28391220

Names of 28391220

• Cardinal: 28391220 can be written as Twenty-eight million, three hundred ninety-one thousand, two hundred twenty.

Scientific notation

• Scientific notation: 2.839122 × 10⁷

Factors of 28391220

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 8
• Sum of prime factors: 1137

Divisors of 28391220

• Number of divisors d(n): 144
• Complete list of divisors:
  1 2 3 4 5 6 9 10 11 12 13 15 18 20 22 26 30 33 36 39 44 45 52 55 60 65 66 78 90 99 110 117 130 132 143 156 165 180 195 198 220 234 260 286 330 390 396 429 468 495 572 585 660 715 780 858 990 1103 1170 1287 1430 1716 1980 2145 2206 2340 2574 2860 3309 4290 4412 5148 5515 6435 6618 8580 9927 11030 12133 12870 13236 14339 16545 19854 22060 24266 25740 28678 33090 36399 39708 43017 48532 49635 57356 60665 66180 71695 72798 86034 99270 109197 121330 129051 143390 145596 157729 172068 181995 198540 215085 218394 242660 258102 286780 315458 363990 430170 436788 473187 516204 545985 630916 645255 727980 788645 860340 946374 1091970 1290510 1419561 1577290 1892748 2183940 2365935 2581020 2839122 3154580 4731870 5678244 7097805 9463740 14195610 28391220
• Sum of all divisors σ(n): 101267712
• Sum of proper divisors (its aliquot sum) s(n): 72876492
• 28391220 is an abundant number, because the sum of its proper divisors (72876492) is greater than itself. Its abundance is 44485272

Bases of 28391220

• Binary: 1101100010011011100110100₂
• Hexadecimal: 0x1B13734
• Base-36: GWIT0

Squares and roots of 28391220

• 28391220 squared (28391220²) is 806061373088400
• 28391220 cubed (28391220³) is 22885065776854843848000
• The square root of 28391220 is 5328.3412052909
• The cube root of 28391220 is 305.0666162831

Scales and comparisons

• 28,391,220 seconds is equal to 46 weeks, 6 days, 14 hours, 27 minutes.
• To count from 1 to 28,391,220 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 28391220 cubic inches would be around 25.4 feet tall.

Recreational maths with 28391220

• 28391220 backwards is 02219382
• The number of decimal digits it has is: 8
• The sum of 28391220's digits is 27
• More coming soon!