Properties of the Number 28623

Twenty-Eight Thousand Six Hundred Twenty-Three

Basics

Value: 28622 → 28623 → 28624

Parity: odd

Prime: No

Previous Prime: 28621

Next Prime: 28627

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 3 × 7 × 29 × 47

Divisors: 1, 3, 7, 21, 29, 47, 87, 141, 203, 329

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 110111111001111

Octal: 67717

Duodecimal: 14693

Hexadecimal: 6fcf

Square: 819276129

Square Root: 169.18333251239616

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

Divide odd numbers into groups with prime(n) elements and add together. A34960

a(n) = Fibonacci(n+9) - Fibonacci(9). A180674

Odd composite integers m such that A000045(2·m-J(m,5)) == 1 (mod m), where J(m,5) is the Jacobi symbol. A340118

s(k)-s(j), where the pairs (k,j) are given by A205862 and A205863, and s(k) denotes the (k+1)-st Fibonacci number. A205864

Fibonacci sequence beginning 0, 29. A22363

Numbers n such that (n / sum of digits of n) is a golden semiprime. A108780

E.g.f. satisfies log(A(x)) = (exp(x·A(x)) - 1)² / 2. A357031

Expansion of 1/((1-x)*(1-3·x)*(1-4·x)*(1-5·x)). A21344

a(n)=Sum((-1)^i+Floor(n/2)S(2i+e),(i=0,..,Floor(n/2))), where S(n) are generalized Tetranacci numbers (A073817) and e=(1/2)(1-(-1)ⁿ). A75112

a(n) = gcd(∑_k=1...n L(k), ∏_j=1...n L(j)), where L(k) is the k-th Lucas number. A239799