81420828788

Names of 81420828788

• Cardinal: 81420828788 can be written as Eighty-one billion, four hundred twenty million, eight hundred twenty-eight thousand, seven hundred eighty-eight.

Scientific notation

• Scientific notation: 8.1420828788 × 10¹⁰

Factors of 81420828788

• Number of distinct prime factors ω(n): 4
• Total number of prime factors Ω(n): 9
• Sum of prime factors: 357

Divisors of 81420828788

• Number of divisors d(n): 96
• Complete list of divisors:
  1 2 4 13 26 31 52 62 124 169 311 338 403 622 676 806 961 1244 1612 1922 2197 3844 4043 4394 5239 8086 8788 9641 10478 12493 16172 19282 20956 24986 29791 38564 49972 52559 59582 68107 105118 119164 125333 136214 162409 210236 250666 272428 298871 324818 387283 501332 597742 649636 683267 774566 1195484 1366534 1549132 1629329 2111317 2733068 3258658 3885323 4222634 5034679 6517316 7770646 8445268 9265001 10069358 15541292 18530002 20138716 21181277 37060004 42362554 50509199 65450827 84725108 101018398 120445013 130901654 202036796 240890026 261803308 481780052 656619587 1313239174 1565785169 2626478348 3131570338 6263140676 20355207197 40710414394 81420828788
• Sum of all divisors σ(n): 160012769280
• Sum of proper divisors (its aliquot sum) s(n): 78591940492
• 81420828788 is a deficient number, because the sum of its proper divisors (78591940492) is less than itself. Its deficiency is 2828888296

Bases of 81420828788

• Binary: 1001011110101000011110100000001110100₂
• Hexadecimal: 0x12F50F4074
• Base-36: 11EJUXKK

Squares and roots of 81420828788

• 81420828788 squared (81420828788²) is 6629351360524809548944
• 81420828788 cubed (81420828788³) is 539767282100785380110876930199872
• The square root of 81420828788 is 285343.3524510427
• The cube root of 81420828788 is 4334.2288598067

Scales and comparisons

• 81,420,828,788 seconds is equal to 2,588 years, 48 weeks, 2 days, 16 hours, 53 minutes, 8 seconds.
• To count from 1 to 81,420,828,788 would take you about five thousand, one hundred seventy-seven 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 81420828788 cubic inches would be around 361.2 feet tall.

Recreational maths with 81420828788

• 81420828788 backwards is 88782802418
• The number of decimal digits it has is: 11
• The sum of 81420828788's digits is 56
• More coming soon!