28238433 has 4 divisors (see below), whose sum is σ = 37651248. Its totient is φ = 18825620.

The previous prime is 28238429. The next prime is 28238447. The reversal of 28238433 is 33483282.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28238433 - 2² = 28238429 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 28238394 and 28238403.

It is not an unprimeable number, because it can be changed into a prime (28238233) 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 3 ways as a sum of consecutive naturals, for example, 4706403 + ... + 4706408.

It is an arithmetic number, because the mean of its divisors is an integer number (9412812).

Almost surely, 2^28238433 is an apocalyptic number.

It is an amenable number.

28238433 is a deficient number, since it is larger than the sum of its proper divisors (9412815).

28238433 is an equidigital number, since it uses as much as digits as its factorization.

28238433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9412814.

The product of its digits is 27648, while the sum is 33.

The square root of 28238433 is about 5313.9846631318. The cubic root of 28238433 is about 304.5183942771.

The spelling of 28238433 in words is "twenty-eight million, two hundred thirty-eight thousand, four hundred thirty-three".