81356400

Names of 81356400

• Cardinal: 81356400 can be written as Eighty-one million, three hundred fifty-six thousand, four hundred.

Scientific notation

• Scientific notation: 8.13564 × 10⁷

Factors of 81356400

• Number of distinct prime factors ω(n): 4
• Total number of prime factors Ω(n): 15
• Sum of prime factors: 41

Divisors of 81356400

• Number of divisors d(n): 270
• Complete list of divisors:
  1 2 3 4 5 6 8 9 10 12 15 16 18 20 24 25 27 30 31 36 40 45 48 50 54 60 62 72 75 80 81 90 93 100 108 120 124 135 144 150 155 162 180 186 200 216 225 240 243 248 270 279 300 310 324 360 372 400 405 432 450 465 486 496 540 558 600 620 648 675 720 729 744 775 810 837 900 930 972 1080 1116 1200 1215 1240 1296 1350 1395 1458 1488 1550 1620 1674 1800 1860 1944 2025 2160 2187 2232 2325 2430 2480 2511 2700 2790 2916 3100 3240 3348 3600 3645 3720 3888 4050 4185 4374 4464 4650 4860 5022 5400 5580 5832 6075 6200 6480 6561 6696 6975 7290 7440 7533 8100 8370 8748 9300 9720 10044 10800 10935 11160 11664 12150 12400 12555 13122 13392 13950 14580 15066 16200 16740 17496 18225 18600 19440 20088 20925 21870 22320 22599 24300 25110 26244 27900 29160 30132 32400 32805 33480 34992 36450 37200 37665 40176 41850 43740 45198 48600 50220 52488 54675 55800 58320 60264 62775 65610 66960 67797 72900 75330 83700 87480 90396 97200 100440 104976 109350 111600 112995 120528 125550 131220 135594 145800 150660 164025 167400 174960 180792 188325 200880 203391 218700 225990 251100 262440 271188 291600 301320 328050 334800 338985 361584 376650 406782 437400 451980 502200 524880 542376 564975 602640 656100 677970 753300 813564 874800 903960 1004400 1016955 1084752 1129950 1312200 1355940 1506600 1627128 1694925 1807920 2033910 2259900 2624400 2711880 3013200 3254256 3389850 4067820 4519800 5084775 5423760 6779700 8135640 9039600 10169550 13559400 16271280 20339100 27118800 40678200 81356400
• Sum of all divisors σ(n): 302630432
• Sum of proper divisors (its aliquot sum) s(n): 221274032
• 81356400 is an abundant number, because the sum of its proper divisors (221274032) is greater than itself. Its abundance is 139917632

Bases of 81356400

• Binary: 100110110010110011001110000₂
• Hexadecimal: 0x4D96670
• Base-36: 1CFR00

Squares and roots of 81356400

• 81356400 squared (81356400²) is 6618863820960000
• 81356400 cubed (81356400³) is 538486932563550144000000
• The square root of 81356400 is 9019.7782677847
• The cube root of 81356400 is 433.3085324399

Scales and comparisons

• 81,356,400 seconds is equal to 2 years, 30 weeks, 3 days, 15 hours.
• To count from 1 to 81,356,400 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 81356400 cubic inches would be around 36.1 feet tall.

Recreational maths with 81356400

• 81356400 backwards is 00465318
• 81356400 is a Harshad number.
• The number of decimal digits it has is: 8
• The sum of 81356400's digits is 27
• More coming soon!