Properties of the Number 28185

Twenty-Eight Thousand One Hundred Eighty-Five

Basics

Value: 28184 → 28185 → 28186

Parity: odd

Prime: No

Previous Prime: 28183

Next Prime: 28201

Digit Sum: 24

Digital Root: 6

Palindrome: No

Factorization: 3 × 5 × 1879

Divisors: 1, 3, 5, 15, 1879, 5637, 9395, 28185

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 110111000011001

Octal: 67031

Duodecimal: 14389

Hexadecimal: 6e19

Square: 794394225

Square Root: 167.88388844674762

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

Perfect Number: No

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: No

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

Numbers n such that the digits of σ(n) are exactly the same (albeit in different order) as the digits of φ(n), in base 10. A175795

a(n) = number of triangles with integer sides i <= j <= k with radius of circumcircle <= n. A331229

Number of even-length integer partitions of n with integer median. A361653

Number of (n+1) X (6+1) 0..2 arrays with the minimum plus the upper median equal to the lower median plus the maximum in every 2 X 2 subblock. A235882

Number of musical scales in n tone equal temperament respecting the property that alternate notes are 3 or 4 semitones apart. A361378

Number of (n+1)X(n+1) 0..2 arrays with the minimum plus the upper median equal to the lower median plus the maximum in every 2X2 subblock. A235876

T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with the minimum plus the upper median equal to the lower median plus the maximum in every 2X2 subblock. A235884

Expansion of 1/((1-5x)(1-7x)(1-9x)(1-11x)). A28185