λ
Sequence Observatory

6,561,036

22 × 32 × 59 × 3089
Abundant Even Composite

Starting at 6,561,036, the Collatz iteration reaches 1 after 85 steps. The first transition is 3280518; the starting value is even with 36 positive divisors.

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Prime Factor Structure

Factorization String 2^2 × 3^2 × 59 × 3089
Distinct Prime Factors 4
Square Status No
Abundance Measure Abundant

Analytical Properties

Total Divisors 36
Divisor Sum (σ) 16,871,400
Proper Divisor Sum 10,310,364
Digit Sum / Digital Root 27 (Root: 9)
Adjacent Primes #6561019 ← → #6561073

Radix Representation

Decimal 6561036
Binary 11001000001110100001100 (23 bits)
Octal 0o31016414
Hexadecimal 0x641D0C

Divisor Catalog (5 of 36)

1 2 3 4 6

Collatz Trajectory (85 steps to reach 1)

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

Showing the first 5 trajectory entries; the stopping-time total above is unchanged.

6,561,036 3,280,518 1,640,259 4,920,778 2,460,389

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