28232289 has 24 divisors (see below), whose sum is σ = 43011072. Its totient is φ = 17818560.

The previous prime is 28232273. The next prime is 28232299. The reversal of 28232289 is 98223282.

It is not a de Polignac number, because 28232289 - 2⁴ = 28232273 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28232249) 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 23 ways as a sum of consecutive naturals, for example, 12037 + ... + 14189.

It is an arithmetic number, because the mean of its divisors is an integer number (1792128).

Almost surely, 2^28232289 is an apocalyptic number.

It is an amenable number.

28232289 is a deficient number, since it is larger than the sum of its proper divisors (14778783).

28232289 is a wasteful number, since it uses less digits than its factorization.

28232289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2237 (or 2234 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 28232289 is about 5313.4065344184. The cubic root of 28232289 is about 304.4963073962.

The spelling of 28232289 in words is "twenty-eight million, two hundred thirty-two thousand, two hundred eighty-nine".