28223033 has 4 divisors (see below), whose sum is σ = 28438608. Its totient is φ = 28007460.

The previous prime is 28223021. The next prime is 28223059. The reversal of 28223033 is 33032282.

It is a happy number.

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 28223033 - 2⁴ = 28223017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28223633) 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, 107591 + ... + 107852.

It is an arithmetic number, because the mean of its divisors is an integer number (7109652).

Almost surely, 2^28223033 is an apocalyptic number.

It is an amenable number.

28223033 is a deficient number, since it is larger than the sum of its proper divisors (215575).

28223033 is a wasteful number, since it uses less digits than its factorization.

28223033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215574.

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 28223033 is about 5312.5354587052. The cubic root of 28223033 is about 304.4630272291.

Subtracting 28223033 from its reverse (33032282), we obtain a square (4809249 = 2193²).

The spelling of 28223033 in words is "twenty-eight million, two hundred twenty-three thousand, thirty-three".