28532289 has 4 divisors (see below), whose sum is σ = 38043056. Its totient is φ = 19021524.

The previous prime is 28532267. The next prime is 28532293. The reversal of 28532289 is 98223582.

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 28532289 - 2⁸ = 28532033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28532089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4755379 + ... + 4755384.

It is an arithmetic number, because the mean of its divisors is an integer number (9510764).

Almost surely, 2^28532289 is an apocalyptic number.

It is an amenable number.

28532289 is a deficient number, since it is larger than the sum of its proper divisors (9510767).

28532289 is an equidigital number, since it uses as much as digits as its factorization.

28532289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9510766.

The product of its digits is 69120, while the sum is 39.

The square root of 28532289 is about 5341.5624118791. The cubic root of 28532289 is about 305.5710487693.

The spelling of 28532289 in words is "twenty-eight million, five hundred thirty-two thousand, two hundred eighty-nine".