628189 has 2 divisors, whose sum is σ = 628190. Its totient is φ = 628188.

The previous prime is 628183. The next prime is 628193. The reversal of 628189 is 981826.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 511225 + 116964 = 715^2 + 342^2 .

It is a cyclic number.

It is not a de Polignac number, because 628189 - 2¹⁷ = 497117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (628183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314094 + 314095.

It is an arithmetic number, because the mean of its divisors is an integer number (314095).

2⁶²⁸¹⁸⁹ is an apocalyptic number.

It is an amenable number.

628189 is a deficient number, since it is larger than the sum of its proper divisors (1).

628189 is an equidigital number, since it uses as much as digits as its factorization.

628189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 34.

The square root of 628189 is about 792.5837495180. The cubic root of 628189 is about 85.6439670629.

The spelling of 628189 in words is "six hundred twenty-eight thousand, one hundred eighty-nine".