81621343520

Names of 81621343520

• Cardinal: 81621343520 can be written as Eighty-one billion, six hundred twenty-one million, three hundred forty-three thousand, five hundred twenty.

Scientific notation

• Scientific notation: 8.162134352 × 10¹⁰

Factors of 81621343520

• Number of distinct prime factors ω(n): 4
• Total number of prime factors Ω(n): 8
• Sum of prime factors: 3054865

Divisors of 81621343520

• Number of divisors d(n): 48
• Complete list of divisors:
  1 2 4 5 8 10 16 20 32 40 80 160 167 334 668 835 1336 1670 2672 3340 5344 6680 13360 26720 3054691 6109382 12218764 15273455 24437528 30546910 48875056 61093820 97750112 122187640 244375280 488750560 510133397 1020266794 2040533588 2550666985 4081067176 5101333970 8162134352 10202667940 16324268704 20405335880 40810671760 81621343520
• Sum of all divisors σ(n): 193985160768
• Sum of proper divisors (its aliquot sum) s(n): 112363817248
• 81621343520 is an abundant number, because the sum of its proper divisors (112363817248) is greater than itself. Its abundance is 30742473728

Bases of 81621343520

• Binary: 1001100000001000000101101110100100000₂
• Hexadecimal: 0x130102DD20
• Base-36: 11HV8NQ8

Squares and roots of 81621343520

• 81621343520 squared (81621343520²) is 6662043718009845990400
• 81621343520 cubed (81621343520³) is 543764958852939650324733022208000
• The square root of 81621343520 is 285694.4933316007
• The cube root of 81621343520 is 4337.7839054537

Scales and comparisons

• 81,621,343,520 seconds is equal to 2,595 years, 15 weeks, 6 days, 11 hours, 25 minutes, 20 seconds.
• To count from 1 to 81,621,343,520 would take you about five thousand, one hundred ninety 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 81621343520 cubic inches would be around 361.5 feet tall.

Recreational maths with 81621343520

• 81621343520 backwards is 02534312618
• The number of decimal digits it has is: 11
• The sum of 81621343520's digits is 35
• More coming soon!