28378433 has 8 divisors (see below), whose sum is σ = 28765152. Its totient is φ = 27994176.

The previous prime is 28378421. The next prime is 28378507. The reversal of 28378433 is 33487382.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28378433 - 2¹⁸ = 28116289 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28378633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35666 + ... + 36452.

It is an arithmetic number, because the mean of its divisors is an integer number (3595644).

Almost surely, 2^28378433 is an apocalyptic number.

It is an amenable number.

28378433 is a deficient number, since it is larger than the sum of its proper divisors (386719).

28378433 is a wasteful number, since it uses less digits than its factorization.

28378433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1231.

The product of its digits is 96768, while the sum is 38.

The square root of 28378433 is about 5327.1411657661. The cubic root of 28378433 is about 305.0208101899.

The spelling of 28378433 in words is "twenty-eight million, three hundred seventy-eight thousand, four hundred thirty-three".