2² × 3 × 19 × 53²

Prime Factor Structure

Factorization String 2^2 × 3 × 19 × 53^2

Distinct Prime Factors 4

Square Status No

Abundance Measure Abundant

Analytical Properties

Total Divisors 36

Divisor Sum (σ) 1,603,280

Proper Divisor Sum 962,828

Digit Sum / Digital Root 21 (Root: 3)

Adjacent Primes #640421 ← → #640457

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

640,452 320,226 160,113 480,340 240,170 120,085 360,256 180,128 90,064 45,032 22,516 11,258 5,629 16,888 8,444 4,222 2,111 6,334 3,167 9,502 4,751 14,254 7,127 21,382 10,691 32,074 16,037 48,112 24,056 12,028 6,014 3,007 9,022 4,511 13,534 6,767 20,302 10,151 30,454 15,227 45,682 22,841 68,524 34,262 17,131 51,394 25,697 77,092 38,546 19,273 57,820 28,910 14,455 43,366 21,683 65,050 32,525 97,576 48,788 24,394

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