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Properties of the Number 28000

Twenty-Eight Thousand

Basics

Value: 27999 → 28000 → 28001

Parity: even

Prime: No

Previous Prime: 27997

Next Prime: 28001

Digit Sum: 10

Digital Root: 1

Palindrome: No

Factorization: 2 5 × 5 3 × 7

Divisors: 1, 2, 4, 5, 7, 8, 10, 14, 16, 20

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

4823 Try Today's Challenge

Representations

Binary: 110110101100000

Octal: 66540

Duodecimal: 14254

Hexadecimal: 6d60

Square: 784000000

Square Root: 167.33200530681512

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

Numbers m having the same sum of divisors as m+20 has. A181647
a(n) = A063997(n)/4. A88406
a(n) = n*(n+1)*(n+2)*a(n-1)/6 for n >= 1; a(0) = 1. A87047
a(n) = n*(4·n2 - 3·n + 5)/6. A174723
Signed triangle used to compute column sequences of array A078741 ((3,3)-Stirling2). A90219
Triangle T(n,m,p,q) = (pn-k*qk + pk*qn-k)*(StirlingS2(n, k) + StirlingS2(n, n-k)) with p=2 and q=5, read by rows. A154922
Numbers with prime factorization pq3r^5. A190011
Arithmetic derivative of 10n. A85708
Partition number array, called M32(-2), related to A004747(n,m) = |S2(-2;n,m)| (generalized Stirling triangle). A143172
Partition number array, called M31(4), related to A049352(n,m)= |S1(4;n,m)| (generalized Stirling triangle). A144354