28235999 has 4 divisors (see below), whose sum is σ = 30802920. Its totient is φ = 25669080.

The previous prime is 28235989. The next prime is 28236007. The reversal of 28235999 is 99953282.

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

It is a cyclic number.

It is not a de Polignac number, because 28235999 - 2¹⁶ = 28170463 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28235959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1283444 + ... + 1283465.

It is an arithmetic number, because the mean of its divisors is an integer number (7700730).

Almost surely, 2^28235999 is an apocalyptic number.

28235999 is a deficient number, since it is larger than the sum of its proper divisors (2566921).

28235999 is a wasteful number, since it uses less digits than its factorization.

28235999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2566920.

The product of its digits is 349920, while the sum is 47.

The square root of 28235999 is about 5313.7556398465. The cubic root of 28235999 is about 304.5096447469.

The spelling of 28235999 in words is "twenty-eight million, two hundred thirty-five thousand, nine hundred ninety-nine".