The number 680

Representation numerals

Greek numeral

χπ

Arabic numeral

٦٨٠

Roman numeral

DCLXXX

Maya numeral


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Chinese numeral

六百八十

Hebrew numeral

תרפ
Numeral systems
Binary: 1010101000
Septimal (base 7): 1661
Octal: 1250
Hexadecimal: 2a8
Base 24: 148
Factorization
680 = 2 × 2 × 2 × 5 × 17
680 has 16 divisors: 1, 2, 4, 5, 8, 10, 17, 20, 34, 40, 68, 85, 136, 170, 340, 680
Sum of all divisors other than 680: 940
Sums & differences
Sum of 2 squares: 680 = 222 + 142 = 262 + 22
Difference of 2 squares: 680 = 272 - 72 = 392 - 292 = 872 - 832 = 1712 - 1692
Goldbach conjecture: 680 = 677 + 3 = 673 + 7 = 661 + 19 = 643 + 37 = 619 + 61 = 613 + 67 = 607 + 73 = 601 + 79 = 577 + 103 = 571 + 109 = . . . (only the first 10 pairs are shown)
Characteristics
680 is a palindromic number in septimal system (1661)
Related primes
The 680th prime number is: 5087
Previous prime number: 677 — Next prime number: 683
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