28233111 has 8 divisors (see below), whose sum is σ = 38032624. Its totient is φ = 18627840.

The previous prime is 28233103. The next prime is 28233113. The reversal of 28233111 is 11133282.

28233111 is nontrivially palindromic in base 7.

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

It is not a de Polignac number, because 28233111 - 2³ = 28233103 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 (28233113) 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, 48220 + ... + 48801.

It is an arithmetic number, because the mean of its divisors is an integer number (4754078).

Almost surely, 2^28233111 is an apocalyptic number.

28233111 is a deficient number, since it is larger than the sum of its proper divisors (9799513).

28233111 is an equidigital number, since it uses as much as digits as its factorization.

28233111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97121.

The product of its digits is 288, while the sum is 21.

The square root of 28233111 is about 5313.4838853618. The cubic root of 28233111 is about 304.4992625649.

Adding to 28233111 its reverse (11133282), we get a palindrome (39366393).

The spelling of 28233111 in words is "twenty-eight million, two hundred thirty-three thousand, one hundred eleven".