643,280

2⁴ × 5 × 11 × 17 × 43

Prime Factor Structure

Factorization String 2^4 × 5 × 11 × 17 × 43

Distinct Prime Factors 5

Square Status No

Abundance Measure Abundant

Total Divisors 80

Divisor Sum (σ) 1,767,744

Proper Divisor Sum 1,124,464

Digit Sum / Digital Root 23 (Root: 5)

Adjacent Primes #643273 ← → #643301

1 2 4 5 8 10 11 16 17 20 22 34 40 43 44 55 68 80 85 86 88 110 136 170 172 176 187 215 220 272 340 344 374 430 440 473 680 688 731 748 860 880 935 946 1,360 1,462 1,496 1,720 1,870 1,892 2,365 2,924 2,992 3,440 3,655 3,740 3,784 4,730 5,848 7,310

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

643,280 321,640 160,820 80,410 40,205 120,616 60,308 30,154 15,077 45,232 22,616 11,308 5,654 2,827 8,482 4,241 12,724 6,362 3,181 9,544 4,772 2,386 1,193 3,580 1,790 895 2,686 1,343 4,030 2,015 6,046 3,023 9,070 4,535 13,606 6,803 20,410 10,205 30,616 15,308 7,654 3,827 11,482 5,741 17,224 8,612 4,306 2,153 6,460 3,230 1,615 4,846 2,423 7,270 3,635 10,906 5,453 16,360 8,180 4,090

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