28529189 has 4 divisors (see below), whose sum is σ = 30723756. Its totient is φ = 26334624.

The previous prime is 28529161. The next prime is 28529197. The reversal of 28529189 is 98192582.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1144900 + 27384289 = 1070^2 + 5233^2 .

It is a cyclic number.

It is not a de Polignac number, because 28529189 - 2¹² = 28525093 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 (28529159) 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, 1097264 + ... + 1097289.

It is an arithmetic number, because the mean of its divisors is an integer number (7680939).

Almost surely, 2^28529189 is an apocalyptic number.

It is an amenable number.

28529189 is a deficient number, since it is larger than the sum of its proper divisors (2194567).

28529189 is a wasteful number, since it uses less digits than its factorization.

28529189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2194566.

The product of its digits is 103680, while the sum is 44.

The square root of 28529189 is about 5341.2722267265. The cubic root of 28529189 is about 305.5599817222.

The spelling of 28529189 in words is "twenty-eight million, five hundred twenty-nine thousand, one hundred eighty-nine".