28233911 has 4 divisors (see below), whose sum is σ = 28696824. Its totient is φ = 27771000.

The previous prime is 28233899. The next prime is 28233913. The reversal of 28233911 is 11933282.

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 28233911 - 2⁶ = 28233847 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 (28233913) 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, 231365 + ... + 231486.

It is an arithmetic number, because the mean of its divisors is an integer number (7174206).

Almost surely, 2^28233911 is an apocalyptic number.

28233911 is a deficient number, since it is larger than the sum of its proper divisors (462913).

28233911 is an equidigital number, since it uses as much as digits as its factorization.

28233911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 462912.

The product of its digits is 2592, while the sum is 29.

The square root of 28233911 is about 5313.5591650042. The cubic root of 28233911 is about 304.5021385865.

The spelling of 28233911 in words is "twenty-eight million, two hundred thirty-three thousand, nine hundred eleven".