28089329 has 4 divisors (see below), whose sum is σ = 28198884. Its totient is φ = 27979776.

The previous prime is 28089241. The next prime is 28089337. The reversal of 28089329 is 92398082.

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 16200625 + 11888704 = 4025^2 + 3448^2 .

It is a cyclic number.

It is not a de Polignac number, because 28089329 - 2²⁰ = 27040753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28089349) 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, 54392 + ... + 54905.

It is an arithmetic number, because the mean of its divisors is an integer number (7049721).

Almost surely, 2^28089329 is an apocalyptic number.

It is an amenable number.

28089329 is a deficient number, since it is larger than the sum of its proper divisors (109555).

28089329 is a wasteful number, since it uses less digits than its factorization.

28089329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109554.

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 28089329 is about 5299.9366977352. The cubic root of 28089329 is about 303.9814775476.

The spelling of 28089329 in words is "twenty-eight million, eighty-nine thousand, three hundred twenty-nine".