28326189 has 4 divisors (see below), whose sum is σ = 37768256. Its totient is φ = 18884124.

The previous prime is 28326173. The next prime is 28326197. The reversal of 28326189 is 98162382.

It is a happy number.

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 not a de Polignac number, because 28326189 - 2⁴ = 28326173 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 (28326149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4721029 + ... + 4721034.

It is an arithmetic number, because the mean of its divisors is an integer number (9442064).

Almost surely, 2^28326189 is an apocalyptic number.

It is an amenable number.

28326189 is a deficient number, since it is larger than the sum of its proper divisors (9442067).

28326189 is an equidigital number, since it uses as much as digits as its factorization.

28326189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9442066.

The product of its digits is 41472, while the sum is 39.

The square root of 28326189 is about 5322.2353386524. The cubic root of 28326189 is about 304.8335165952.

The spelling of 28326189 in words is "twenty-eight million, three hundred twenty-six thousand, one hundred eighty-nine".