28765223 has 2 divisors, whose sum is σ = 28765224. Its totient is φ = 28765222.

The previous prime is 28765211. The next prime is 28765277. The reversal of 28765223 is 32256782.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28765223 - 2⁶ = 28765159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28765283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14382611 + 14382612.

It is an arithmetic number, because the mean of its divisors is an integer number (14382612).

Almost surely, 2^28765223 is an apocalyptic number.

28765223 is a deficient number, since it is larger than the sum of its proper divisors (1).

28765223 is an equidigital number, since it uses as much as digits as its factorization.

28765223 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40320, while the sum is 35.

The square root of 28765223 is about 5363.3220115895. The cubic root of 28765223 is about 306.4003438961.

The spelling of 28765223 in words is "twenty-eight million, seven hundred sixty-five thousand, two hundred twenty-three".