Properties of the Number 90087

Ninety Thousand Eighty-Seven

Basics

Value: 90086 → 90087 → 90088

Parity: odd

Prime: No

Previous Prime: 90073

Next Prime: 90089

Digit Sum: 24

Digital Root: 6

Palindrome: No

Factorization: 3 × 30029

Divisors: 1, 3, 30029, 90087

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 10101111111100111

Octal: 257747

Duodecimal: 44173

Hexadecimal: 15fe7

Square: 8115667569

Square Root: 300.14496497525994

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

The Collatz or 3x+1 function: a(n) = n/2 if n is even, otherwise (3n+1)/2. A14682

Number of forests with 2n nodes and n labeled trees. Also number of forests with exactly n edges on 2n labeled nodes. A302112

Number of labeled graphs with n nodes and floor(n/2) edges. A331505

Smallest odd pseudoprimes to base n, not necessarily exceeding n. Compare with A007535 and A090086. A90087

a(n) = A302112(n) * n! * 2ⁿ. A331500

Decimal expansion of exp(3/4). A331501

Square array read by ascending antidiagonals: T(n,k) is the parity of the k-th iterate of the 3x+1 function started at n, with n >= 1 and k >= 0. A365495

Number of (n+2)X(7+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00010101 or 01010101. A261291

Decimal expansion of exp(4/9). A331502

Decimal expansion of the expected length of the first cycle in an evolving graph with n vertices rescaled by n^-1/6. A343980