28528189 has 2 divisors, whose sum is σ = 28528190. Its totient is φ = 28528188.

The previous prime is 28528183. The next prime is 28528231. The reversal of 28528189 is 98182582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26440164 + 2088025 = 5142^2 + 1445^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28528189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28528183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14264094 + 14264095.

It is an arithmetic number, because the mean of its divisors is an integer number (14264095).

Almost surely, 2^28528189 is an apocalyptic number.

It is an amenable number.

28528189 is a deficient number, since it is larger than the sum of its proper divisors (1).

28528189 is an equidigital number, since it uses as much as digits as its factorization.

28528189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 92160, while the sum is 43.

The square root of 28528189 is about 5341.1786152496. The cubic root of 28528189 is about 305.5564115360.

The spelling of 28528189 in words is "twenty-eight million, five hundred twenty-eight thousand, one hundred eighty-nine".