28143223 has 8 divisors (see below), whose sum is σ = 28435968. Its totient is φ = 27852384.

The previous prime is 28143209. The next prime is 28143239. The reversal of 28143223 is 32234182.

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

It is a cyclic number.

It is not a de Polignac number, because 28143223 - 2⁹ = 28142711 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28143263) 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 in 7 ways as a sum of consecutive naturals, for example, 73290 + ... + 73672.

It is an arithmetic number, because the mean of its divisors is an integer number (3554496).

Almost surely, 2^28143223 is an apocalyptic number.

28143223 is a deficient number, since it is larger than the sum of its proper divisors (292745).

28143223 is a wasteful number, since it uses less digits than its factorization.

28143223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 953.

The product of its digits is 2304, while the sum is 25.

The square root of 28143223 is about 5305.0186616071. The cubic root of 28143223 is about 304.1757661713.

The spelling of 28143223 in words is "twenty-eight million, one hundred forty-three thousand, two hundred twenty-three".