81355572072

Names of 81355572072

• Cardinal: 81355572072 can be written as Eighty-one billion, three hundred fifty-five million, five hundred seventy-two thousand and seventy-two.

Scientific notation

• Scientific notation: 8.1355572072 × 10¹⁰

Factors of 81355572072

• Number of distinct prime factors ω(n): 4
• Total number of prime factors Ω(n): 8
• Sum of prime factors: 4767757

Divisors of 81355572072

• Number of divisors d(n): 64
• Complete list of divisors:
  1 2 3 4 6 8 9 12 18 24 27 36 54 72 79 108 158 216 237 316 474 632 711 948 1422 1896 2133 2844 4266 5688 8532 17064 4767673 9535346 14303019 19070692 28606038 38141384 42909057 57212076 85818114 114424152 128727171 171636228 257454342 343272456 376646167 514908684 753292334 1029817368 1129938501 1506584668 2259877002 3013169336 3389815503 4519754004 6779631006 9039508008 10169446509 13559262012 20338893018 27118524024 40677786036 81355572072
• Sum of all divisors σ(n): 228848352000
• Sum of proper divisors (its aliquot sum) s(n): 147492779928
• 81355572072 is an abundant number, because the sum of its proper divisors (147492779928) is greater than itself. Its abundance is 66137207856

Bases of 81355572072

• Binary: 1001011110001001010111000001101101000₂
• Hexadecimal: 0x12F12B8368
• Base-36: 11DH0960

Squares and roots of 81355572072

• 81355572072 squared (81355572072²) is 6618729107162386373184
• 81355572072 cubed (81355572072³) is 538470492902793735991081600117248
• The square root of 81355572072 is 285228.9818233765
• The cube root of 81355572072 is 4333.0706257201

Scales and comparisons

• 81,355,572,072 seconds is equal to 2,586 years, 44 weeks, 3 days, 10 hours, 1 minute, 12 seconds.
• To count from 1 to 81,355,572,072 would take you about five thousand, one hundred seventy-three 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 81355572072 cubic inches would be around 361.1 feet tall.

Recreational maths with 81355572072

• 81355572072 backwards is 27027555318
• The number of decimal digits it has is: 11
• The sum of 81355572072's digits is 45
• More coming soon!