28855223 has 2 divisors, whose sum is σ = 28855224. Its totient is φ = 28855222.

The previous prime is 28855219. The next prime is 28855231. The reversal of 28855223 is 32255882.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28855223 - 2² = 28855219 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28855213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14427611 + 14427612.

It is an arithmetic number, because the mean of its divisors is an integer number (14427612).

Almost surely, 2^28855223 is an apocalyptic number.

28855223 is a deficient number, since it is larger than the sum of its proper divisors (1).

28855223 is an equidigital number, since it uses as much as digits as its factorization.

28855223 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38400, while the sum is 35.

The square root of 28855223 is about 5371.7057812207. The cubic root of 28855223 is about 306.7195641003.

The spelling of 28855223 in words is "twenty-eight million, eight hundred fifty-five thousand, two hundred twenty-three".