628289 has 2 divisors, whose sum is σ = 628290. Its totient is φ = 628288.

The previous prime is 628267. The next prime is 628301. The reversal of 628289 is 982826.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 588289 + 40000 = 767^2 + 200^2 .

It is a cyclic number.

It is not a de Polignac number, because 628289 - 2¹⁶ = 562753 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a nialpdrome in base 16.

It is not a weakly prime, because it can be changed into another prime (628219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314144 + 314145.

It is an arithmetic number, because the mean of its divisors is an integer number (314145).

2⁶²⁸²⁸⁹ is an apocalyptic number.

It is an amenable number.

628289 is a deficient number, since it is larger than the sum of its proper divisors (1).

628289 is an equidigital number, since it uses as much as digits as its factorization.

628289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13824, while the sum is 35.

The square root of 628289 is about 792.6468318236. The cubic root of 628289 is about 85.6485113122.

The spelling of 628289 in words is "six hundred twenty-eight thousand, two hundred eighty-nine".