Properties of the Number 87820

Eighty-Seven Thousand Eight Hundred Twenty

Basics

Value: 87819 → 87820 → 87821

Parity: even

Prime: No

Previous Prime: 87811

Next Prime: 87833

Digit Sum: 25

Digital Root: 7

Palindrome: No

Factorization: 2 ² × 5 × 4391

Divisors: 1, 2, 4, 5, 10, 20, 4391, 8782, 17564, 21955

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10101011100001100

Octal: 253414

Duodecimal: 429A4

Hexadecimal: 1570c

Square: 7712352400

Square Root: 296.3443942442644

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

Irregular triangle read by rows: T(n,k) is number of sequences of length k over {0,1,...,n-1} containing no two consecutive blocks with the same average, n >= 1, 0 <= k <= A379914(n). A379998

Primes P of the form P=(j·P(i)#)/2 - 2 such that P+4 is the next prime, where j is odd, 0 < j < P(i+1), P(i) = i-th prime, P(i)# = i-th primorial (A002110). A87820