81861800800

Names of 81861800800

• Cardinal: 81861800800 can be written as Eighty-one billion, eight hundred sixty-one million, eight hundred thousand, eight hundred.

Scientific notation

• Scientific notation: 8.18618008 × 10¹⁰

Factors of 81861800800

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 11
• Sum of prime factors: 456

Divisors of 81861800800

• Number of divisors d(n): 216
• Complete list of divisors:
  1 2 4 5 8 10 13 16 20 25 26 32 40 50 52 65 80 100 104 130 160 173 200 208 260 263 325 346 400 416 520 526 650 692 800 865 1040 1052 1300 1315 1384 1730 2080 2104 2249 2600 2630 2768 3419 3460 4208 4325 4498 5200 5260 5536 6575 6838 6920 8416 8650 8996 10400 10520 11245 13150 13676 13840 17095 17300 17992 21040 22490 26300 27352 27680 29929 34190 34600 35984 42080 44980 45499 52600 54704 56225 59858 68380 69200 71968 85475 89960 90998 105200 109408 112450 119716 136760 138400 149645 170950 179920 181996 210400 224900 227495 239432 273520 299290 341900 359840 363992 389077 449800 454990 478864 547040 591487 598580 683800 727984 748225 778154 899600 909980 957728 1137475 1182974 1197160 1367600 1455968 1496450 1556308 1799200 1819960 1945385 2274950 2365948 2394320 2735200 2957435 2992900 3112616 3639920 3890770 4549900 4731896 4788640 5914870 5985800 6225232 7279840 7781540 7871327 9099800 9463792 9726925 11829740 11971600 12450464 14787175 15563080 15742654 18199600 18927584 19453850 23659480 23943200 29574350 31126160 31485308 36399200 38907700 39356635 47318960 59148700 62252320 62970616 77815400 78713270 94637920 102327251 118297400 125941232 155630800 157426540 196783175 204654502 236594800 251882464 311261600 314853080 393566350 409309004 473189600 511636255 629706160 787132700 818618008 1023272510 1259412320 1574265400 1637236016 2046545020 2558181275 3148530800 3274472032 4093090040 5116362550 6297061600 8186180080 10232725100 16372360160 20465450200 40930900400 81861800800
• Sum of all divisors σ(n): 217292123664
• Sum of proper divisors (its aliquot sum) s(n): 135430322864
• 81861800800 is an abundant number, because the sum of its proper divisors (135430322864) is greater than itself. Its abundance is 53568522064

Bases of 81861800800

• Binary: 1001100001111010101111111001101100000₂
• Hexadecimal: 0x130F57F360
• Base-36: 11LUEHR4

Squares and roots of 81861800800

• 81861800800 squared (81861800800²) is 6701354430218880640000
• 81861800800 cubed (81861800800³) is 548584941456775507350656512000000
• The square root of 81861800800 is 286115.0132376839
• The cube root of 81861800800 is 4342.0394472319

Scales and comparisons

• 81,861,800,800 seconds is equal to 2,602 years, 49 weeks, 3 days, 13 hours, 6 minutes, 40 seconds.
• To count from 1 to 81,861,800,800 would take you about five thousand, two hundred 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 81861800800 cubic inches would be around 361.8 feet tall.

Recreational maths with 81861800800

• 81861800800 backwards is 00800816818
• 81861800800 is a Harshad number.
• The number of decimal digits it has is: 11
• The sum of 81861800800's digits is 40
• More coming soon!