28146223 has 4 divisors (see below), whose sum is σ = 32167120. Its totient is φ = 24125328.

The previous prime is 28146221. The next prime is 28146229. The reversal of 28146223 is 32264182.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28146223 - 2¹ = 28146221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28146191 and 28146200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28146221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2010438 + ... + 2010451.

It is an arithmetic number, because the mean of its divisors is an integer number (8041780).

Almost surely, 2^28146223 is an apocalyptic number.

28146223 is a deficient number, since it is larger than the sum of its proper divisors (4020897).

28146223 is an equidigital number, since it uses as much as digits as its factorization.

28146223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4020896.

The product of its digits is 4608, while the sum is 28.

The square root of 28146223 is about 5305.3014051984. The cubic root of 28146223 is about 304.1865739228.

The spelling of 28146223 in words is "twenty-eight million, one hundred forty-six thousand, two hundred twenty-three".