28357189 has 8 divisors (see below), whose sum is σ = 32443520. Its totient is φ = 24279696.

The previous prime is 28357171. The next prime is 28357193. The reversal of 28357189 is 98175382.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28357189 - 2²³ = 19968581 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 (28357289) by changing a digit.

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, 7567 + ... + 10675.

It is an arithmetic number, because the mean of its divisors is an integer number (4055440).

Almost surely, 2^28357189 is an apocalyptic number.

It is an amenable number.

28357189 is a deficient number, since it is larger than the sum of its proper divisors (4086331).

28357189 is a wasteful number, since it uses less digits than its factorization.

28357189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4419.

The product of its digits is 120960, while the sum is 43.

The square root of 28357189 is about 5325.1468524352. The cubic root of 28357189 is about 304.9446786701.

The spelling of 28357189 in words is "twenty-eight million, three hundred fifty-seven thousand, one hundred eighty-nine".