28356189 has 12 divisors (see below), whose sum is σ = 39904416. Its totient is φ = 17908488.

The previous prime is 28356173. The next prime is 28356197. The reversal of 28356189 is 98165382.

It is not a de Polignac number, because 28356189 - 2⁴ = 28356173 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28356189.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28356109) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12009 + ... + 14174.

It is an arithmetic number, because the mean of its divisors is an integer number (3325368).

Almost surely, 2^28356189 is an apocalyptic number.

It is an amenable number.

28356189 is a deficient number, since it is larger than the sum of its proper divisors (11548227).

28356189 is a wasteful number, since it uses less digits than its factorization.

28356189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26224 (or 26205 counting only the distinct ones).

The product of its digits is 103680, while the sum is 42.

The square root of 28356189 is about 5325.0529574831. The cubic root of 28356189 is about 304.9410940616.

The spelling of 28356189 in words is "twenty-eight million, three hundred fifty-six thousand, one hundred eighty-nine".