28906223 has 4 divisors (see below), whose sum is σ = 28917960. Its totient is φ = 28894488.

The previous prime is 28906219. The next prime is 28906237. The reversal of 28906223 is 32260982.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 28906223 - 2² = 28906219 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28906223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28906123) 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, 593 + ... + 7626.

It is an arithmetic number, because the mean of its divisors is an integer number (7229490).

Almost surely, 2^28906223 is an apocalyptic number.

28906223 is a deficient number, since it is larger than the sum of its proper divisors (11737).

28906223 is an equidigital number, since it uses as much as digits as its factorization.

28906223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11736.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 28906223 is about 5376.4507809521. The cubic root of 28906223 is about 306.9001609942.

The spelling of 28906223 in words is "twenty-eight million, nine hundred six thousand, two hundred twenty-three".