28039223 has 4 divisors (see below), whose sum is σ = 28098240. Its totient is φ = 27980208.

The previous prime is 28039217. The next prime is 28039237. The reversal of 28039223 is 32293082.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28039223 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28039523) 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, 28790 + ... + 29747.

It is an arithmetic number, because the mean of its divisors is an integer number (7024560).

Almost surely, 2^28039223 is an apocalyptic number.

28039223 is a deficient number, since it is larger than the sum of its proper divisors (59017).

28039223 is an equidigital number, since it uses as much as digits as its factorization.

28039223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59016.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 28039223 is about 5295.2075502288. The cubic root of 28039223 is about 303.8006216613.

The spelling of 28039223 in words is "twenty-eight million, thirty-nine thousand, two hundred twenty-three".