81920287840400

Names of 81920287840400

• Cardinal: 81920287840400 can be written as Eighty-one trillion, nine hundred twenty billion, two hundred eighty-seven million, eight hundred forty thousand, four hundred.

Scientific notation

• Scientific notation: 8.19202878404 × 10¹³

Factors of 81920287840400

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 10
• Sum of prime factors: 73194

Divisors of 81920287840400

• Number of divisors d(n): 180
• Complete list of divisors:
  1 2 4 5 8 10 16 17 20 25 34 40 50 68 80 85 100 136 170 200 272 289 340 400 425 578 680 850 1156 1360 1445 1700 2312 2890 3400 4624 5780 6800 7225 11489 11560 14450 22978 23120 28900 45956 57445 57800 61681 91912 114890 115600 123362 183824 195313 229780 246724 287225 308405 390626 459560 493448 574450 616810 781252 919120 976565 986896 1048577 1148900 1233620 1542025 1562504 1953130 2097154 2297800 2467240 3084050 3125008 3320321 3906260 4194308 4595600 4882825 4934480 5242885 6168100 6640642 7812520 8388616 9765650 10485770 12336200 13281284 15625040 16601605 16777232 17825809 19531300 20971540 24672400 26214425 26562568 33203210 35651618 39062600 41943080 52428850 53125136 66406420 71303236 78125200 83008025 83886160 89129045 104857700 132812840 142606472 166016050 178258090 209715400 265625680 285212944 332032100 356516180 419430800 445645225 664064200 708653009 713032360 891290450 1328128400 1417306018 1426064720 1782580900 2834612036 3543265045 3565161800 5669224072 7086530090 7130323600 11338448144 12047101153 14173060180 17716325225 24094202306 28346120360 35432650450 48188404612 56692240720 60235505765 70865300900 96376809224 120471011530 141730601800 192753618448 204800719601 240942023060 283461203600 301177528825 409601439202 481884046120 602355057650 819202878404 963768092240 1024003598005 1204710115300 1638405756808 2048007196010 2409420230600 3276811513616 4096014392020 4818840461200 5120017990025 8192028784040 10240035980050 16384057568080 20480071960100 40960143920200 81920287840400
• Sum of all divisors σ(n): 209093358706860
• Sum of proper divisors (its aliquot sum) s(n): 127173070866460
• 81920287840400 is an abundant number, because the sum of its proper divisors (127173070866460) is greater than itself. Its abundance is 45252783026060

Bases of 81920287840400

• Binary: 10010101000000110001101101010000001100010010000₂
• Hexadecimal: 0x4A818DA81890
• Base-36: T1DNS9EA8

Squares and roots of 81920287840400

• 81920287840400 squared (81920287840400²) is 6710933559853988095872160000
• 81920287840400 cubed (81920287840400³) is 549761608901038946609722458280883264000000
• The square root of 81920287840400 is 9050982.7002596795
• The cube root of 81920287840400 is 43430.7327325847

Scales and comparisons

• 81,920,287,840,400 seconds is equal to 2,604,811 years, 39 weeks, 2 days, 15 hours, 13 minutes, 20 seconds.
• To count from 1 to 81,920,287,840,400 would take you about six million, five hundred twelve thousand and twenty-nine 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 81920287840400 cubic inches would be around 3619.2 feet tall.

Recreational maths with 81920287840400

• 81920287840400 backwards is 00404878202918
• The number of decimal digits it has is: 14
• The sum of 81920287840400's digits is 53
• More coming soon!