28403223 has 8 divisors (see below), whose sum is σ = 39092736. Its totient is φ = 18324600.

The previous prime is 28403213. The next prime is 28403237. The reversal of 28403223 is 32230482.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28403223 - 2⁵ = 28403191 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28403193 and 28403202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28403213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 152613 + ... + 152798.

It is an arithmetic number, because the mean of its divisors is an integer number (4886592).

Almost surely, 2^28403223 is an apocalyptic number.

28403223 is a deficient number, since it is larger than the sum of its proper divisors (10689513).

28403223 is a wasteful number, since it uses less digits than its factorization.

28403223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305445.

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 28403223 is about 5329.4674217974. The cubic root of 28403223 is about 305.1096013877.

The spelling of 28403223 in words is "twenty-eight million, four hundred three thousand, two hundred twenty-three".