678289 has 2 divisors, whose sum is σ = 678290. Its totient is φ = 678288.

The previous prime is 678253. The next prime is 678299. The reversal of 678289 is 982876.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 588289 + 90000 = 767^2 + 300^2 .

It is a cyclic number.

It is not a de Polignac number, because 678289 - 2¹¹ = 676241 is a prime.

It is not a weakly prime, because it can be changed into another prime (678229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339144 + 339145.

It is an arithmetic number, because the mean of its divisors is an integer number (339145).

2⁶⁷⁸²⁸⁹ is an apocalyptic number.

It is an amenable number.

678289 is a deficient number, since it is larger than the sum of its proper divisors (1).

678289 is an equidigital number, since it uses as much as digits as its factorization.

678289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 40.

The square root of 678289 is about 823.5830255657. The cubic root of 678289 is about 87.8627768342.

The spelling of 678289 in words is "six hundred seventy-eight thousand, two hundred eighty-nine".