Properties of the Number 87

Eighty-Seven

Basics

Value: 86 → 87 → 88

Parity: odd

Prime: No

Previous Prime: 83

Next Prime: 89

Digit Sum: 15

Digital Root: 6

Palindrome: No

Factorization: 3 × 29

Divisors: 1, 3, 29, 87

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: 1010111

Octal: 127

Duodecimal: 73

Hexadecimal: 57

Square: 7569

Square Root: 9.327379053088816

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

Coordination sequence for planar net 3.3.3.3.6 (also called the fsz net). A250120

Squarefree numbers: numbers that are not divisible by a square greater than 1. A5117

Semiprimes (or biprimes): products of two primes. A1358

Expansion of ∏_k>=0 (1 + x^2k+1); number of partitions of n into distinct odd parts; number of self-conjugate partitions; number of symmetric Ferrers graphs with n nodes. A700

The odd numbers: a(n) = 2·n + 1. A5408

The composite numbers: numbers n of the form x·y for x > 1 and y > 1. A2808

Completely multiplicative with a(prime(k)) = prime(k+1). A3961

Squarefree semiprimes: Numbers that are the product of two distinct primes. A6881

The nonprime numbers: 1 together with the composite numbers, A002808. A18252

EKG sequence (or ECG sequence): a(1) = 1; a(2) = 2; for n > 2, a(n) = smallest number not already used which shares a factor with a(n-1). A64413

We use cookies

Some cookies are essential for Natory to function, like keeping you signed in. We also use optional cookies to understand how the app is used and improve it over time. Learn more in our Privacy Policy. You can manage your preferences anytime.