28139930

Names of 28139930

• Cardinal: 28139930 can be written as Twenty-eight million, one hundred thirty-nine thousand, nine hundred thirty.

Scientific notation

• Scientific notation: 2.813993 × 10⁷

Factors of 28139930

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 7
• Sum of prime factors: 151

Divisors of 28139930

• Number of divisors d(n): 96
• Complete list of divisors:
  1 2 5 7 10 13 14 17 26 34 35 65 70 85 91 107 119 130 170 182 214 221 238 289 442 455 535 578 595 749 910 1070 1105 1190 1391 1445 1498 1547 1819 2023 2210 2782 2890 3094 3638 3745 3757 4046 6955 7490 7514 7735 9095 9737 10115 12733 13910 15470 18190 18785 19474 20230 23647 25466 26299 30923 37570 47294 48685 52598 61846 63665 97370 118235 127330 131495 154615 165529 216461 236470 262990 309230 331058 401999 432922 803998 827645 1082305 1655290 2009995 2164610 2813993 4019990 5627986 14069965 28139930
• Sum of all divisors σ(n): 66842496
• Sum of proper divisors (its aliquot sum) s(n): 38702566
• 28139930 is an abundant number, because the sum of its proper divisors (38702566) is greater than itself. Its abundance is 10562636

Bases of 28139930

• Binary: 1101011010110000110011010₂
• Hexadecimal: 0x1AD619A
• Base-36: GR4WQ

Squares and roots of 28139930

• 28139930 squared (28139930²) is 791855660404900
• 28139930 cubed (28139930³) is 22282762853897657657000
• The square root of 28139930 is 5304.7082860417
• The cube root of 28139930 is 304.1639019785

Scales and comparisons

• 28,139,930 seconds is equal to 46 weeks, 3 days, 16 hours, 38 minutes, 50 seconds.
• To count from 1 to 28,139,930 would take you about seventeen 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 28139930 cubic inches would be around 25.3 feet tall.

Recreational maths with 28139930

• 28139930 backwards is 03993182
• 28139930 is a Harshad number.
• The number of decimal digits it has is: 8
• The sum of 28139930's digits is 35
• More coming soon!