28378233 has 24 divisors (see below), whose sum is σ = 44903040. Its totient is φ = 17163360.

The previous prime is 28378199. The next prime is 28378247. The reversal of 28378233 is 33287382.

It is not a de Polignac number, because 28378233 - 2¹⁴ = 28361849 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28378283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4848 + ... + 8958.

It is an arithmetic number, because the mean of its divisors is an integer number (1870960).

Almost surely, 2^28378233 is an apocalyptic number.

It is an amenable number.

28378233 is a deficient number, since it is larger than the sum of its proper divisors (16524807).

28378233 is a wasteful number, since it uses less digits than its factorization.

28378233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4189 (or 4186 counting only the distinct ones).

The product of its digits is 48384, while the sum is 36.

The square root of 28378233 is about 5327.1223939384. The cubic root of 28378233 is about 305.0200936327.

The spelling of 28378233 in words is "twenty-eight million, three hundred seventy-eight thousand, two hundred thirty-three".