28304223 has 8 divisors (see below), whose sum is σ = 38759088. Its totient is φ = 18359424.

The previous prime is 28304219. The next prime is 28304231. The reversal of 28304223 is 32240382.

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

It is not a de Polignac number, because 28304223 - 2² = 28304219 is a prime.

It is a super-2 number, since 2×28304223² = 1602258079267458, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28304193 and 28304202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28304273) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 127386 + ... + 127607.

It is an arithmetic number, because the mean of its divisors is an integer number (4844886).

Almost surely, 2^28304223 is an apocalyptic number.

28304223 is a deficient number, since it is larger than the sum of its proper divisors (10454865).

28304223 is a wasteful number, since it uses less digits than its factorization.

28304223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255033.

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

The square root of 28304223 is about 5320.1713318276. The cubic root of 28304223 is about 304.7547001967.

The spelling of 28304223 in words is "twenty-eight million, three hundred four thousand, two hundred twenty-three".