81967378720

Names of 81967378720

• Cardinal: 81967378720 can be written as Eighty-one billion, nine hundred sixty-seven million, three hundred seventy-eight thousand, seven hundred twenty.

Scientific notation

• Scientific notation: 8.196737872 × 10¹⁰

Factors of 81967378720

• Number of distinct prime factors ω(n): 4
• Total number of prime factors Ω(n): 11
• Sum of prime factors: 105

Divisors of 81967378720

• Number of divisors d(n): 120
• Complete list of divisors:
  1 2 4 5 8 10 16 20 32 37 40 61 74 80 122 148 160 185 244 296 305 370 488 592 610 740 976 1184 1220 1480 1952 2257 2440 2960 3721 4514 4880 5920 7442 9028 9760 11285 14884 18056 18605 22570 29768 36112 37210 45140 59536 72224 74420 90280 119072 137677 148840 180560 226981 275354 297680 361120 453962 550708 595360 688385 907924 1101416 1134905 1376770 1815848 2202832 2269810 2753540 3631696 4405664 4539620 5507080 7263392 8398297 9079240 11014160 13845841 16796594 18158480 22028320 27691682 33593188 36316960 41991485 55383364 67186376 69229205 83982970 110766728 134372752 138458410 167965940 221533456 268745504 276916820 335931880 443066912 512296117 553833640 671863760 1024592234 1107667280 1343727520 2049184468 2215334560 2561480585 4098368936 5122961170 8196737872 10245922340 16393475744 20491844680 40983689360 81967378720
• Sum of all divisors σ(n): 202196354220
• Sum of proper divisors (its aliquot sum) s(n): 120228975500
• 81967378720 is an abundant number, because the sum of its proper divisors (120228975500) is greater than itself. Its abundance is 38261596780

Bases of 81967378720

• Binary: 1001100010101101000101111000100100000₂
• Hexadecimal: 0x1315A2F120
• Base-36: 11NL9E74

Squares and roots of 81967378720

• 81967378720 squared (81967378720²) is 6718651174227908838400
• 81967378720 cubed (81967378720³) is 550710225285511707350768078848000
• The square root of 81967378720 is 286299.4563739163
• The cube root of 81967378720 is 4343.9053014413

Scales and comparisons

• 81,967,378,720 seconds is equal to 2,606 years, 16 weeks, 12 hours, 18 minutes, 40 seconds.
• To count from 1 to 81,967,378,720 would take you about five thousand, two hundred twelve 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 81967378720 cubic inches would be around 362 feet tall.

Recreational maths with 81967378720

• 81967378720 backwards is 02787376918
• The number of decimal digits it has is: 11
• The sum of 81967378720's digits is 58
• More coming soon!