81972072

Names of 81972072

• Cardinal: 81972072 can be written as Eighty-one million, nine hundred seventy-two thousand and seventy-two.

Scientific notation

• Scientific notation: 8.1972072 × 10⁷

Factors of 81972072

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 8
• Sum of prime factors: 12536

Divisors of 81972072

• Number of divisors d(n): 96
• Complete list of divisors:
  1 2 3 4 6 7 8 9 12 13 14 18 21 24 26 28 36 39 42 52 56 63 72 78 84 91 104 117 126 156 168 182 234 252 273 312 364 468 504 546 728 819 936 1092 1638 2184 3276 6552 12511 25022 37533 50044 75066 87577 100088 112599 150132 162643 175154 225198 262731 300264 325286 350308 450396 487929 525462 650572 700616 788193 900792 975858 1050924 1138501 1301144 1463787 1576386 1951716 2101848 2277002 2927574 3152772 3415503 3903432 4554004 5855148 6305544 6831006 9108008 10246509 11710296 13662012 20493018 27324024 40986036 81972072
• Sum of all divisors σ(n): 273262080
• Sum of proper divisors (its aliquot sum) s(n): 191290008
• 81972072 is an abundant number, because the sum of its proper divisors (191290008) is greater than itself. Its abundance is 109317936

Bases of 81972072

• Binary: 100111000101100101101101000₂
• Hexadecimal: 0x4E2CB68
• Base-36: 1CSY20

Squares and roots of 81972072

• 81972072 squared (81972072²) is 6719420587973184
• 81972072 cubed (81972072³) is 550804828235620172917248
• The square root of 81972072 is 9053.8429409837
• The cube root of 81972072 is 434.3988207491

Scales and comparisons

• 81,972,072 seconds is equal to 2 years, 31 weeks, 3 days, 18 hours, 1 minute, 12 seconds.
• To count from 1 to 81,972,072 would take you about 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 81972072 cubic inches would be around 36.2 feet tall.

Recreational maths with 81972072

• 81972072 backwards is 27027918
• 81972072 is a Harshad number.
• The number of decimal digits it has is: 8
• The sum of 81972072's digits is 36
• More coming soon!