644378127021909

Names of 644378127021909

• Cardinal: 644378127021909 can be written as Six hundred forty-four trillion, three hundred seventy-eight billion, one hundred twenty-seven million, twenty-one thousand, nine hundred nine.

Scientific notation

• Scientific notation: 6.44378127021909 × 10¹⁴

Factors of 644378127021909

• Number of distinct prime factors ω(n): 4
• Total number of prime factors Ω(n): 7
• Sum of prime factors: 59814176862

Divisors of 644378127021909

• Number of divisors d(n): 40
• Complete list of divisors:
  1 3 7 9 19 21 27 57 63 81 133 171 189 399 513 567 1197 1539 3591 10773 59814176833 179442530499 418699237831 538327591497 1136469359827 1256097713493 1614982774491 3409408079481 3768293140479 4844948323473 7955285518789 10228224238443 11304879421437 23865856556367 30684672715329 33914638264311 71597569669101 92054018145987 214792709007303 644378127021909
• Sum of all divisors σ(n): 1158002463506240
• Sum of proper divisors (its aliquot sum) s(n): 513624336484331
• 644378127021909 is a deficient number, because the sum of its proper divisors (513624336484331) is less than itself. Its deficiency is 130753790537578

Bases of 644378127021909

• Binary: 10010010100000111011111001010111001011011101010101₂
• Hexadecimal: 0x24A0EF95CB755
• Base-36: 6CEV83H8B9

Squares and roots of 644378127021909

• 644378127021909 squared (644378127021909²) is 415223170584263489769366004281
• 644378127021909 cubed (644378127021909³) is 267560728957186327656398356613421801474792429
• The square root of 644378127021909 is 25384604.1336458307
• The cube root of 644378127021909 is 86373.4493027111

Scales and comparisons

• 644,378,127,021,909 seconds is equal to 20,489,231 years, 12 weeks, 5 days, 20 hours, 45 minutes, 9 seconds.
• To count from 1 to 644,378,127,021,909 would take you about fifty-one million, two hundred twenty-three thousand and seventy-eight 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 644378127021909 cubic inches would be around 7197.8 feet tall.

Recreational maths with 644378127021909

• 644378127021909 backwards is 909120721873446
• 644378127021909 is a Harshad number.
• The number of decimal digits it has is: 15
• The sum of 644378127021909's digits is 63
• More coming soon!