720,644

2² × 180161

720,644 factors as 2^2 × 180161. Its 6 positive divisors give a proper-divisor sum of 540,490, so this integer is deficient. The Collatz stopping time is 66 steps.

Prime Factor Structure

Factorization String 2^2 × 180161

Distinct Prime Factors 2

Square Status No

Abundance Measure Deficient

Analytical Properties

Total Divisors 6

Divisor Sum (σ) 1,261,134

Proper Divisor Sum 540,490

Digit Sum / Digital Root 23 (Root: 5)

Adjacent Primes #720619 ← → #720653

Radix Representation

Decimal	720644
Binary	10101111111100000100 (20 bits)
Octal	0o2577404
Hexadecimal	0xAFF04

Divisor Catalog (6)

1 2 4 180,161 360,322 720,644

Collatz Trajectory (66 steps to reach 1)

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

720,644 360,322 180,161 540,484 270,242 135,121 405,364 202,682 101,341 304,024 152,012 76,006 38,003 114,010 57,005 171,016 85,508 42,754 21,377 64,132 32,066 16,033 48,100 24,050 12,025 36,076 18,038 9,019 27,058 13,529 40,588 20,294 10,147 30,442 15,221 45,664 22,832 11,416 5,708 2,854 1,427 4,282 2,141 6,424 3,212 1,606 803 2,410 1,205 3,616 1,808 904 452 226 113 340 170 85 256 128

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