2² × 7 × 89 × 257

Prime Factor Structure

Factorization String 2^2 × 7 × 89 × 257

Distinct Prime Factors 4

Square Status No

Abundance Measure Abundant

Analytical Properties

Total Divisors 24

Divisor Sum (σ) 1,300,320

Proper Divisor Sum 659,876

Digit Sum / Digital Root 22 (Root: 4)

Adjacent Primes #640421 ← → #640457

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

640,444 320,222 160,111 480,334 240,167 720,502 360,251 1,080,754 540,377 1,621,132 810,566 405,283 1,215,850 607,925 1,823,776 911,888 455,944 227,972 113,986 56,993 170,980 85,490 42,745 128,236 64,118 32,059 96,178 48,089 144,268 72,134 36,067 108,202 54,101 162,304 81,152 40,576 20,288 10,144 5,072 2,536 1,268 634 317 952 476 238 119 358 179 538 269 808 404 202 101 304 152 76 38 19

Other feeder batches with open delivery windows. Each feeder keeps its own target batch.