640940490785210891

Names of 640940490785210891

• Cardinal: 640940490785210891 can be written as Six hundred forty quadrillion, nine hundred forty trillion, four hundred ninety billion, seven hundred eighty-five million, two hundred ten thousand, eight hundred ninety-one.

Scientific notation

• Scientific notation: 6.40940490785210891 × 10¹⁷

Factors of 640940490785210891

• Number of distinct prime factors ω(n): 4
• Total number of prime factors Ω(n): 7
• Sum of prime factors: 21770

Divisors of 640940490785210891

• Number of divisors d(n): 54
• Complete list of divisors:
  1 11 19 209 361 601 3971 6611 11419 21139 125609 216961 232529 361201 401641 2386571 3973211 4418051 6862819 7631179 12704539 75491009 83942969 130393561 139749929 241386241 446857321 1434329171 2655248651 4586338579 4915430531 7635427939 8490289099 50449724369 83989707329 93393180089 145073130841 161315492881 268561249921 1595804439251 1774470421691 2756389485979 2954173749131 5102663748499 30320284345769 56129301233489 96950611221481 161405311202521 1066456723436291 1775458423227731 3066700912847899 33733710041326889 58267317344110081 640940490785210891
• Sum of all divisors σ(n): 739209956896736676
• Sum of proper divisors (its aliquot sum) s(n): 98269466111525785
• 640940490785210891 is a deficient number, because the sum of its proper divisors (98269466111525785) is less than itself. Its deficiency is 542671024673685106

Bases of 640940490785210891

• Binary: 100011100101000100111111101100000011011010101100001000001011₂
• Hexadecimal: 0x8E513FB036AC20B
• Base-36: 4VAYFWMCFYTN

Squares and roots of 640940490785210891

• 640940490785210891 squared (640940490785210891²) is 410804712727987007078309323345013881
• 640940490785210891 cubed (640940490785210891³) is 263301374192753563538546764540704206502287139907377971
• The square root of 640940490785210891 is 800587590.9513030237
• The cube root of 640940490785210891 is 862195.7998165891

Scales and comparisons

• 640,940,490,785,210,891 seconds is equal to 20,379,925,047 years, 44 weeks, 5 days, 10 hours, 8 minutes, 11 seconds.
• To count from 1 to 640,940,490,785,210,891 would take you about sixty-one billion, one hundred thirty-nine million, seven hundred seventy-five thousand, one hundred forty-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 640940490785210891 cubic inches would be around 71849.6 feet tall.

Recreational maths with 640940490785210891

• 640940490785210891 backwards is 198012587094049046
• The number of decimal digits it has is: 18
• The sum of 640940490785210891's digits is 77
• More coming soon!