28028329 has 16 divisors (see below), whose sum is σ = 33758208. Its totient is φ = 22750992.

The previous prime is 28028327. The next prime is 28028347. The reversal of 28028329 is 92382082.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 28028329 - 2¹ = 28028327 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28028294 and 28028303.

It is not an unprimeable number, because it can be changed into a prime (28028321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16414 + ... + 18040.

It is an arithmetic number, because the mean of its divisors is an integer number (2109888).

Almost surely, 2^28028329 is an apocalyptic number.

It is an amenable number.

28028329 is a deficient number, since it is larger than the sum of its proper divisors (5729879).

28028329 is a wasteful number, since it uses less digits than its factorization.

28028329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1764.

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 28028329 is about 5294.1787842875. The cubic root of 28028329 is about 303.7612716326.

The spelling of 28028329 in words is "twenty-eight million, twenty-eight thousand, three hundred twenty-nine".