28355189 has 4 divisors (see below), whose sum is σ = 29014656. Its totient is φ = 27695724.

The previous prime is 28355161. The next prime is 28355213. The reversal of 28355189 is 98155382.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28355189 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 (28354189) 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 3 ways as a sum of consecutive naturals, for example, 329669 + ... + 329754.

It is an arithmetic number, because the mean of its divisors is an integer number (7253664).

Almost surely, 2^28355189 is an apocalyptic number.

It is an amenable number.

28355189 is a deficient number, since it is larger than the sum of its proper divisors (659467).

28355189 is an equidigital number, since it uses as much as digits as its factorization.

28355189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 659466.

The product of its digits is 86400, while the sum is 41.

The square root of 28355189 is about 5324.9590608755. The cubic root of 28355189 is about 304.9375093688.

The spelling of 28355189 in words is "twenty-eight million, three hundred fifty-five thousand, one hundred eighty-nine".