Properties of the Number 28669

Twenty-Eight Thousand Six Hundred Sixty-Nine

Basics

Value: 28668 → 28669 → 28670

Parity: odd

Prime: Yes

Previous Prime: 28663

Next Prime: 28687

Digit Sum: 31

Digital Root: 4

Palindrome: No

Factorization: 28669

Divisors: 1, 28669

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 110111111111101

Octal: 67775

Duodecimal: 14711

Hexadecimal: 6ffd

Square: 821911561

Square Root: 169.31922513406445

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

Primes p = p_n+1 such that p_n + p_n+2 = 2·p_n+1 + 12. A95673

Primes p such that A001175(p) = (p-1)/6. A308791

Numbers k such that σ(σ(2k-1)) is a prime p. A247821

Number of numbers in row n of the array at A243851. A243853

Primes p such that σ(σ(2p-1)) is a prime. A247790

a(n) = 7·2ⁿ - 3. A156127

Primes in the chain of repeated application of x->2·x+3, starting at x=11. A225582

Discriminants of totally real cubic fields in which every norm-positive unit is totally positive. A329769

a(n) = 1 + ∑_k=1..n-4 a(k) * a(n-k-4). A346076

Irregular table with first row containing the single term 3; in the n-th row, n>=2, we list in increasing order those d=2ⁿ⁺¹-a, for each term a in all the preceding rows, such that d is prime. A152871