Properties of the Number 90128

Ninety Thousand One Hundred Twenty-Eight

Basics

Value: 90127 → 90128 → 90129

Parity: even

Prime: No

Previous Prime: 90127

Next Prime: 90149

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 2 ⁴ × 43 × 131

Divisors: 1, 2, 4, 8, 16, 43, 86, 131, 172, 262

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 10110000000010000

Octal: 260020

Duodecimal: 441A8

Hexadecimal: 16010

Square: 8123056384

Square Root: 300.2132575353727

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

Triangle read by rows of Stirling numbers of first kind, s(n,k), n >= 1, 1 <= k <= n. A8275

a(n) = (2n-1)!! * (2n+1)!!, where the double factorial is A006882. A79484

a(n) = floor((3·n + 2)²/24 + 1/3). A282513

Triangle read by rows: Stirling numbers of the first kind (A008275) mod 2. A87755

Number of idempotent reversible binary (i.e., radius one half) cellular automata of order n. Equivalently, number of loop-noded symmetric 2-colored unique 2-path graphs on n nodes. Equivalently, number of idempotent semicentral bigroupoids of order n. A63467

Distinct values of σ(k), the sum of divisors, in order of appearance as k grows. A90128