28390223 has 2 divisors, whose sum is σ = 28390224. Its totient is φ = 28390222.

The previous prime is 28390213. The next prime is 28390247. The reversal of 28390223 is 32209382.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28390223 - 2⁴ = 28390207 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28390213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14195111 + 14195112.

It is an arithmetic number, because the mean of its divisors is an integer number (14195112).

Almost surely, 2^28390223 is an apocalyptic number.

28390223 is a deficient number, since it is larger than the sum of its proper divisors (1).

28390223 is an equidigital number, since it uses as much as digits as its factorization.

28390223 is an evil number, because the sum of its binary digits is even.

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

The square root of 28390223 is about 5328.2476481485. The cubic root of 28390223 is about 305.0630452849.

The spelling of 28390223 in words is "twenty-eight million, three hundred ninety thousand, two hundred twenty-three".