640,044

2² × 3² × 23 × 773

Prime Factor Structure

Factorization String 2^2 × 3^2 × 23 × 773

Distinct Prime Factors 4

Square Status No

Abundance Measure Abundant

Total Divisors 36

Divisor Sum (σ) 1,690,416

Proper Divisor Sum 1,050,372

Digit Sum / Digital Root 18 (Root: 9)

Adjacent Primes #640043 ← → #640049

1 2 3 4 6 9 12 18 23 36 46 69 92 138 207 276 414 773 828 1,546 2,319 3,092 4,638 6,957 9,276 13,914 17,779 27,828 35,558 53,337 71,116 106,674 160,011 213,348 320,022 640,044

Iterative sequence n → n/2 (if even) or 3n+1 (if odd):

640,044 320,022 160,011 480,034 240,017 720,052 360,026 180,013 540,040 270,020 135,010 67,505 202,516 101,258 50,629 151,888 75,944 37,972 18,986 9,493 28,480 14,240 7,120 3,560 1,780 890 445 1,336 668 334 167 502 251 754 377 1,132 566 283 850 425 1,276 638 319 958 479 1,438 719 2,158 1,079 3,238 1,619 4,858 2,429 7,288 3,644 1,822 911 2,734 1,367 4,102

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