The number 280

Representation numerals

Greek numeral

σπ

Arabic numeral

٢٨٠

Roman numeral

CCLXXX

Maya numeral

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Chinese numeral

二百八十

Hebrew numeral

רפ
Numeral systems
Binary: 100011000
Septimal (base 7): 550
Octal: 430
Hexadecimal: 118
Base 24: BG
Factorization
280 = 2 × 2 × 2 × 5 × 7
280 has 16 divisors: 1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140, 280
Sum of all divisors other than 280: 440
Sums & differences
Difference of 2 squares: 280 = 172 - 32 = 192 - 92 = 372 - 332 = 712 - 692
Goldbach conjecture: 280 = 277 + 3 = 269 + 11 = 263 + 17 = 257 + 23 = 251 + 29 = 239 + 41 = 233 + 47 = 227 + 53 = 197 + 83 = 191 + 89 = . . . (only the first 10 pairs are shown)
Characteristics
280 is a octogonal number
Related primes
The 280th prime number is: 1811
Previous prime number: 277 — Next prime number: 281
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