Properties of the Number 28225

Twenty-Eight Thousand Two Hundred Twenty-Five

Basics

Value: 28224 → 28225 → 28226

Parity: odd

Prime: No

Previous Prime: 28219

Next Prime: 28229

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 5 ² × 1129

Divisors: 1, 5, 25, 1129, 5645, 28225

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 110111001000001

Octal: 67101

Duodecimal: 14401

Hexadecimal: 6e41

Square: 796650625

Square Root: 168.00297616411441

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 k such that (A003961(k)-2·k) divides (A003961(k)-σ(k)), where A003961 is fully multiplicative with a(prime(i)) = prime(i+1), and σ is the sum of divisors function. A378980

Let A(0) = 1, B(0) = 0 and C(0) = 0. Let A(n+1) = - ∑_{k = 0..n} binomial(n,k)*C(k), B(n+1) = ∑_{k = 0..n} binomial(n,k)*A(k) and C(n+1) = ∑_{k = 0..n} binomial(n,k)*B(k). This entry gives the sequence B(n). A143631

a(n) = 6ⁿ(B_n(1/6)-B_n(0)) where B_n(x) is the n-th Bernoulli polynomial. A83010

Numbers of the form (square + 1) that are not squarefree. A124809

Odd numbers k for which A003961(k)-2k divides A003961(k)-σ(k), where A003961 shifts the prime factorization one step towards larger primes, and σ is the sum of divisors function. A349753

Numbers of the form m² + 1 that can be expressed in more than one way as j² + k² with j > k > 1. A299708

Numerator of Hermite(n, 1/14). A159507

a(n) = 36·n² + 1. A158591

a(n) = 16·n² + 1. A108211

a(n) = 64·n² + 1. A158686