28015223 has 2 divisors, whose sum is σ = 28015224. Its totient is φ = 28015222.

The previous prime is 28015193. The next prime is 28015271. The reversal of 28015223 is 32251082.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28015223 - 2⁶ = 28015159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28015123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14007611 + 14007612.

It is an arithmetic number, because the mean of its divisors is an integer number (14007612).

Almost surely, 2^28015223 is an apocalyptic number.

28015223 is a deficient number, since it is larger than the sum of its proper divisors (1).

28015223 is an equidigital number, since it uses as much as digits as its factorization.

28015223 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 28015223 is about 5292.9408649634. The cubic root of 28015223 is about 303.7139181627.

The spelling of 28015223 in words is "twenty-eight million, fifteen thousand, two hundred twenty-three".