191228 has 6 divisors (see below), whose sum is σ = 334656. Its totient is φ = 95612.

The previous prime is 191227. The next prime is 191231. The reversal of 191228 is 822191.

191228 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23900 + ... + 23907.

It is an arithmetic number, because the mean of its divisors is an integer number (55776).

2¹⁹¹²²⁸ is an apocalyptic number.

It is an amenable number.

191228 is a deficient number, since it is larger than the sum of its proper divisors (143428).

191228 is a wasteful number, since it uses less digits than its factorization.

191228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47811 (or 47809 counting only the distinct ones).

The product of its digits is 288, while the sum is 23.

The square root of 191228 is about 437.2962382642. The cubic root of 191228 is about 57.6125583471.

It can be divided in two parts, 19 and 1228, that multiplied together give a palindrome (23332).

The spelling of 191228 in words is "one hundred ninety-one thousand, two hundred twenty-eight".