81690980020

Names of 81690980020

• Cardinal: 81690980020 can be written as Eighty-one billion, six hundred ninety million, nine hundred eighty thousand and twenty.

Scientific notation

• Scientific notation: 8.169098002 × 10¹⁰

Factors of 81690980020

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 8
• Sum of prime factors: 11939

Divisors of 81690980020

• Number of divisors d(n): 144
• Complete list of divisors:
  1 2 4 5 10 13 20 23 26 46 52 65 89 92 115 130 169 178 230 260 299 338 356 445 460 598 676 845 890 1157 1196 1495 1690 1780 2047 2314 2990 3380 3887 4094 4628 5785 5980 7774 8188 10235 11570 11807 15041 15548 19435 20470 23140 23614 26611 30082 38870 40940 47228 53222 59035 60164 75205 77740 106444 118070 133055 150410 153491 236140 266110 271561 300820 306982 345943 532220 543122 613964 691886 767455 1050823 1086244 1357805 1383772 1534910 1729715 1995383 2101646 2715610 3069820 3459430 3530293 3990766 4203292 5254115 5431220 6918860 7060586 7981532 9976915 10508230 13660699 14121172 17651465 19953830 21016460 24168929 27321398 35302930 39907660 45893809 48337858 54642796 68303495 70605860 91787618 96675716 120844645 136606990 177589087 183575236 229469045 241689290 273213980 314196077 355178174 458938090 483378580 628392154 710356348 887945435 917876180 1256784308 1570980385 1775890870 3141960770 3551781740 4084549001 6283921540 8169098002 16338196004 20422745005 40845490010 81690980020
• Sum of all divisors σ(n): 196033582080
• Sum of proper divisors (its aliquot sum) s(n): 114342602060
• 81690980020 is an abundant number, because the sum of its proper divisors (114342602060) is greater than itself. Its abundance is 32651622040

Bases of 81690980020

• Binary: 1001100000101001010010110111010110100₂
• Hexadecimal: 0x1305296EB4
• Base-36: 11J0P7LG

Squares and roots of 81690980020

• 81690980020 squared (81690980020²) is 6673416216628039200400
• 81690980020 cubed (81690980020³) is 545157910817705142091653176008000
• The square root of 81690980020 is 285816.3396658771
• The cube root of 81690980020 is 4339.0171703977

Scales and comparisons

• 81,690,980,020 seconds is equal to 2,597 years, 27 weeks, 10 hours, 53 minutes, 40 seconds.
• To count from 1 to 81,690,980,020 would take you about five thousand, one hundred ninety-five 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 81690980020 cubic inches would be around 361.6 feet tall.

Recreational maths with 81690980020

• 81690980020 backwards is 02008909618
• The number of decimal digits it has is: 11
• The sum of 81690980020's digits is 43
• More coming soon!