28328223 has 24 divisors (see below), whose sum is σ = 47934720. Its totient is φ = 14715120.

The previous prime is 28328213. The next prime is 28328233. The reversal of 28328223 is 32282382.

It is an interprime number because it is at equal distance from previous prime (28328213) and next prime (28328233).

It is not a de Polignac number, because 28328223 - 2⁴ = 28328207 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28328213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7143 + ... + 10376.

It is an arithmetic number, because the mean of its divisors is an integer number (1997280).

Almost surely, 2^28328223 is an apocalyptic number.

28328223 is a deficient number, since it is larger than the sum of its proper divisors (19606497).

28328223 is a wasteful number, since it uses less digits than its factorization.

28328223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17547 (or 17540 counting only the distinct ones).

The product of its digits is 9216, while the sum is 30.

The square root of 28328223 is about 5322.4264203463. The cubic root of 28328223 is about 304.8408127471.

The spelling of 28328223 in words is "twenty-eight million, three hundred twenty-eight thousand, two hundred twenty-three".