81021238389

Names of 81021238389

• Cardinal: 81021238389 can be written as Eighty-one billion, twenty-one million, two hundred thirty-eight thousand, three hundred eighty-nine.

Scientific notation

• Scientific notation: 8.1021238389 × 10¹⁰

Factors of 81021238389

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 10
• Sum of prime factors: 907

Divisors of 81021238389

• Number of divisors d(n): 160
• Complete list of divisors:
  1 3 7 9 13 21 27 39 49 63 91 117 127 147 189 273 343 351 381 441 637 757 819 889 1029 1143 1323 1651 1911 2271 2401 2457 2667 3087 3429 4459 4953 5299 5733 6223 6813 7203 8001 9261 9841 11557 13377 14859 15897 17199 18669 20439 21609 24003 29523 31213 34671 37093 40131 43561 44577 47691 56007 64827 68887 80899 88569 93639 96139 104013 111279 120393 130683 143073 168021 206661 242697 259651 265707 280917 288417 304927 312039 333837 392049 482209 566293 619983 672973 728091 778953 842751 865251 914781 1001511 1176147 1249807 1446627 1698879 1817557 1859949 2018919 2184273 2336859 2595753 2744343 3375463 3749421 3964051 4339881 4710811 5096637 5452671 6056757 7010577 8233029 8748649 10126389 11248263 11892153 13019643 14132433 15289911 16358013 18170271 23628241 26245947 30379167 32975677 33744789 35676459 42397299 49074039 61240543 70884723 78737841 91137501 98927031 107029377 127191897 183721629 212654169 230829739 236213523 296781093 428683801 551164887 637962507 692489217 890343279 1286051403 1653494661 2077467651 3000786607 3858154209 6232402953 9002359821 11574462627 27007079463 81021238389
• Sum of all divisors σ(n): 152187965440
• Sum of proper divisors (its aliquot sum) s(n): 71166727051
• 81021238389 is a deficient number, because the sum of its proper divisors (71166727051) is less than itself. Its deficiency is 9854511338

Bases of 81021238389

• Binary: 1001011011101001111011111110001110101₂
• Hexadecimal: 0x12DD3DFC75
• Base-36: 117XYBN9

Squares and roots of 81021238389

• 81021238389 squared (81021238389²) is 6564441070087167315321
• 81021238389 cubed (81021238389³) is 531859144830074640064351873057869
• The square root of 81021238389 is 284642.2990157997
• The cube root of 81021238389 is 4327.1268390781

Scales and comparisons

• 81,021,238,389 seconds is equal to 2,576 years, 11 weeks, 4 days, 19 hours, 33 minutes, 9 seconds.
• To count from 1 to 81,021,238,389 would take you about five thousand, one hundred fifty-two 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 81021238389 cubic inches would be around 360.6 feet tall.

Recreational maths with 81021238389

• 81021238389 backwards is 98383212018
• The number of decimal digits it has is: 11
• The sum of 81021238389's digits is 45
• More coming soon!