Properties of the Number 28990

Twenty-Eight Thousand Nine Hundred Ninety

Basics

Value: 28989 → 28990 → 28991

Parity: even

Prime: No

Previous Prime: 28979

Next Prime: 29009

Digit Sum: 28

Digital Root: 1

Palindrome: No

Factorization: 2 × 5 × 13 × 223

Divisors: 1, 2, 5, 10, 13, 26, 65, 130, 223, 446

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 111000100111110

Octal: 70476

Duodecimal: 1493A

Hexadecimal: 713e

Square: 840420100

Square Root: 170.26450011673015

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

T(n,k)=Number of (n+2)X(k+2) 0..3 arrays with every 3X3 subblock row and column sum not 1 3 6 or 8 and every diagonal and antidiagonal sum 1 3 6 or 8. A252053

Composite numbers k such that σ(k)*(φ(k) + 2) is a square. A65655

Starting positions of strings of 3 0's in the decimal expansion of π. A50202

Number of (n+2)X(2+2) 0..3 arrays with every 3X3 subblock row and column sum not 1 3 6 or 8 and every diagonal and antidiagonal sum 1 3 6 or 8. A252047

Number of nX3 1..3 arrays containing at least one of each value, all equal values connected, rows considered as a single number in nondecreasing order, and columns considered as a single number in nonincreasing order. A166831

Largest palindromic prime with 2n-1 digits. A28990

Prime numbers p such that v_p(A000166(k)) = v_p(k-1) for all k > 1, where v_p(k) is the p-adic valuation of k. A337986