645,405

3 × 5 × 17 × 2531

645,405 factors as 3 × 5 × 17 × 2531. Its 16 positive divisors give a proper-divisor sum of 448,419, so this integer is deficient. The Collatz stopping time is 141 steps.

Prime Factor Structure

Factorization String 3 × 5 × 17 × 2531

Distinct Prime Factors 4

Square Status No

Abundance Measure Deficient

Analytical Properties

Total Divisors 16

Divisor Sum (σ) 1,093,824

Proper Divisor Sum 448,419

Digit Sum / Digital Root 24 (Root: 6)

Adjacent Primes #645397 ← → #645409

Radix Representation

Decimal	645405
Binary	10011101100100011101 (20 bits)
Octal	0o2354435
Hexadecimal	0x9D91D

Divisor Catalog (16)

1 3 5 15 17 51 85 255 2,531 7,593 12,655 37,965 43,027 129,081 215,135 645,405

Collatz Trajectory (141 steps to reach 1)

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

645,405 1,936,216 968,108 484,054 242,027 726,082 363,041 1,089,124 544,562 272,281 816,844 408,422 204,211 612,634 306,317 918,952 459,476 229,738 114,869 344,608 172,304 86,152 43,076 21,538 10,769 32,308 16,154 8,077 24,232 12,116 6,058 3,029 9,088 4,544 2,272 1,136 568 284 142 71 214 107 322 161 484 242 121 364 182 91 274 137 412 206 103 310 155 466 233 700

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