28238033 has 4 divisors (see below), whose sum is σ = 28427700. Its totient is φ = 28048368.

The previous prime is 28238027. The next prime is 28238039. The reversal of 28238033 is 33083282.

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

It is an interprime number because it is at equal distance from previous prime (28238027) and next prime (28238039).

It can be written as a sum of positive squares in 2 ways, for example, as 14227984 + 14010049 = 3772^2 + 3743^2 .

It is a cyclic number.

It is not a de Polignac number, because 28238033 - 2⁴ = 28238017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28237987 and 28238005.

It is not an unprimeable number, because it can be changed into a prime (28238039) 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, 94610 + ... + 94907.

It is an arithmetic number, because the mean of its divisors is an integer number (7106925).

Almost surely, 2^28238033 is an apocalyptic number.

It is an amenable number.

28238033 is a deficient number, since it is larger than the sum of its proper divisors (189667).

28238033 is a wasteful number, since it uses less digits than its factorization.

28238033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189666.

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 28238033 is about 5313.9470264578. The cubic root of 28238033 is about 304.5169564266.

The spelling of 28238033 in words is "twenty-eight million, two hundred thirty-eight thousand, thirty-three".