81329430

Names of 81329430

• Cardinal: 81329430 can be written as Eighty-one million, three hundred twenty-nine thousand, four hundred thirty.

Scientific notation

• Scientific notation: 8.132943 × 10⁷

Factors of 81329430

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 8
• Sum of prime factors: 61

Divisors of 81329430

• Number of divisors d(n): 128
• Complete list of divisors:
  1 2 3 5 6 7 10 13 14 15 21 26 30 31 35 39 42 62 65 70 78 91 93 105 130 155 182 186 195 210 217 273 310 390 403 434 455 465 546 651 806 910 930 961 1085 1209 1302 1365 1922 2015 2170 2418 2730 2821 2883 3255 4030 4805 5642 5766 6045 6510 6727 8463 9610 12090 12493 13454 14105 14415 16926 20181 24986 28210 28830 29791 33635 37479 40362 42315 59582 62465 67270 74958 84630 87451 89373 100905 124930 148955 174902 178746 187395 201810 208537 262353 297910 374790 387283 417074 437255 446865 524706 625611 774566 874510 893730 1042685 1161849 1251222 1311765 1936415 2085370 2323698 2623530 2710981 3128055 3872830 5421962 5809245 6256110 8132943 11618490 13554905 16265886 27109810 40664715 81329430
• Sum of all divisors σ(n): 248242176
• Sum of proper divisors (its aliquot sum) s(n): 166912746
• 81329430 is an abundant number, because the sum of its proper divisors (166912746) is greater than itself. Its abundance is 85583316

Bases of 81329430

• Binary: 100110110001111110100010110₂
• Hexadecimal: 0x4D8FD16
• Base-36: 1CF66U

Squares and roots of 81329430

• 81329430 squared (81329430²) is 6614476184124900
• 81329430 cubed (81329430³) is 537951577803453165807000
• The square root of 81329430 is 9018.2830960223
• The cube root of 81329430 is 433.2606459277

Scales and comparisons

• 81,329,430 seconds is equal to 2 years, 30 weeks, 3 days, 7 hours, 30 minutes, 30 seconds.
• To count from 1 to 81,329,430 would take you about three years!

  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 81329430 cubic inches would be around 36.1 feet tall.

Recreational maths with 81329430

• 81329430 backwards is 03492318
• 81329430 is a Harshad number.
• The number of decimal digits it has is: 8
• The sum of 81329430's digits is 30
• More coming soon!