628191 has 12 divisors (see below), whose sum is σ = 914368. Its totient is φ = 415584.

The previous prime is 628189. The next prime is 628193. The reversal of 628191 is 191826.

It is an interprime number because it is at equal distance from previous prime (628189) and next prime (628193).

It is not a de Polignac number, because 628191 - 2¹ = 628189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1851 + ... + 2163.

2⁶²⁸¹⁹¹ is an apocalyptic number.

628191 is a deficient number, since it is larger than the sum of its proper divisors (286177).

628191 is a wasteful number, since it uses less digits than its factorization.

628191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 542 (or 539 counting only the distinct ones).

The product of its digits is 864, while the sum is 27.

The square root of 628191 is about 792.5850112133. The cubic root of 628191 is about 85.6440579526.

The spelling of 628191 in words is "six hundred twenty-eight thousand, one hundred ninety-one".