28532389 has 2 divisors, whose sum is σ = 28532390. Its totient is φ = 28532388.

The previous prime is 28532381. The next prime is 28532401. The reversal of 28532389 is 98323582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22724289 + 5808100 = 4767^2 + 2410^2 .

It is a cyclic number.

It is not a de Polignac number, because 28532389 - 2³ = 28532381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28532381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14266194 + 14266195.

It is an arithmetic number, because the mean of its divisors is an integer number (14266195).

Almost surely, 2^28532389 is an apocalyptic number.

It is an amenable number.

28532389 is a deficient number, since it is larger than the sum of its proper divisors (1).

28532389 is an equidigital number, since it uses as much as digits as its factorization.

28532389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 103680, while the sum is 40.

The square root of 28532389 is about 5341.5717724280. The cubic root of 28532389 is about 305.5714057575.

The spelling of 28532389 in words is "twenty-eight million, five hundred thirty-two thousand, three hundred eighty-nine".