81395978004

Names of 81395978004

• Cardinal: 81395978004 can be written as Eighty-one billion, three hundred ninety-five million, nine hundred seventy-eight thousand and four.

Scientific notation

• Scientific notation: 8.1395978004 × 10¹⁰

Factors of 81395978004

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 8
• Sum of prime factors: 203662

Divisors of 81395978004

• Number of divisors d(n): 96
• Complete list of divisors:
  1 2 3 4 6 9 11 12 18 22 27 33 36 44 54 66 99 108 132 198 297 337 396 594 674 1011 1188 1348 2022 3033 3707 4044 6066 7414 9099 11121 12132 14828 18198 22242 33363 36396 44484 66726 100089 133452 200178 203309 400356 406618 609927 813236 1219854 1829781 2236399 2439708 3659562 4472798 5489343 6709197 7319124 8945596 10978686 13418394 20127591 21957372 26836788 40255182 60382773 68515133 80510364 120765546 137030266 205545399 241531092 274060532 411090798 616636197 753666463 822181596 1233272394 1507332926 1849908591 2260999389 2466544788 3014665852 3699817182 4521998778 6782998167 7399634364 9043997556 13565996334 20348994501 27131992668 40697989002 81395978004
• Sum of all divisors σ(n): 230895100800
• Sum of proper divisors (its aliquot sum) s(n): 149499122796
• 81395978004 is an abundant number, because the sum of its proper divisors (149499122796) is greater than itself. Its abundance is 68103144792

Bases of 81395978004

• Binary: 1001011110011100101000000111100010100₂
• Hexadecimal: 0x12F3940F14
• Base-36: 11E52AL0

Squares and roots of 81395978004

• 81395978004 squared (81395978004²) is 6625305235227651824016
• 81395978004 cubed (81395978004³) is 539273199196375993800176814944064
• The square root of 81395978004 is 285299.8037223299
• The cube root of 81395978004 is 4333.7878590343

Scales and comparisons

• 81,395,978,004 seconds is equal to 2,588 years, 7 weeks, 2 days, 1 hour, 53 minutes, 24 seconds.
• To count from 1 to 81,395,978,004 would take you about five thousand, one hundred seventy-six 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 81395978004 cubic inches would be around 361.1 feet tall.

Recreational maths with 81395978004

• 81395978004 backwards is 40087959318
• 81395978004 is a Harshad number.
• The number of decimal digits it has is: 11
• The sum of 81395978004's digits is 54
• More coming soon!