643,672

2³ × 61 × 1319

Prime Factor Structure

Factorization String 2^3 × 61 × 1319

Distinct Prime Factors 3

Square Status No

Abundance Measure Deficient

Total Divisors 16

Divisor Sum (σ) 1,227,600

Proper Divisor Sum 583,928

Digit Sum / Digital Root 28 (Root: 1)

Adjacent Primes #643661 ← → #643681

1 2 4 8 61 122 244 488 1,319 2,638 5,276 10,552 80,459 160,918 321,836 643,672

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

643,672 321,836 160,918 80,459 241,378 120,689 362,068 181,034 90,517 271,552 135,776 67,888 33,944 16,972 8,486 4,243 12,730 6,365 19,096 9,548 4,774 2,387 7,162 3,581 10,744 5,372 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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