628188 has 24 divisors (see below), whose sum is σ = 1599360. Its totient is φ = 190320.

The previous prime is 628183. The next prime is 628189. The reversal of 628188 is 881826.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628183) by changing a digit.

628188 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2248 + ... + 2511.

It is an arithmetic number, because the mean of its divisors is an integer number (66640).

2⁶²⁸¹⁸⁸ is an apocalyptic number.

It is an amenable number.

628188 is an abundant number, since it is smaller than the sum of its proper divisors (971172).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

628188 is a wasteful number, since it uses less digits than its factorization.

628188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4777 (or 4775 counting only the distinct ones).

The product of its digits is 6144, while the sum is 33.

The square root of 628188 is about 792.5831186696. The cubic root of 628188 is about 85.6439216180.

It can be divided in two parts, 62818 and 8, that added together give a palindrome (62826).

The spelling of 628188 in words is "six hundred twenty-eight thousand, one hundred eighty-eight".