28333333 has 4 divisors (see below), whose sum is σ = 32380960. Its totient is φ = 24285708.

The previous prime is 28333307. The next prime is 28333367. The reversal of 28333333 is 33333382.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28333333 - 2⁵ = 28333301 is a prime.

It is a Duffinian number.

28333333 is a modest number, since divided by 3333 gives 2833 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28333303) 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 3 ways as a sum of consecutive naturals, for example, 2023803 + ... + 2023816.

It is an arithmetic number, because the mean of its divisors is an integer number (8095240).

Almost surely, 2^28333333 is an apocalyptic number.

It is an amenable number.

28333333 is a deficient number, since it is larger than the sum of its proper divisors (4047627).

28333333 is an equidigital number, since it uses as much as digits as its factorization.

28333333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4047626.

The product of its digits is 11664, while the sum is 28.

The square root of 28333333 is about 5322.9064429126. The cubic root of 28333333 is about 304.8591412635.

The spelling of 28333333 in words is "twenty-eight million, three hundred thirty-three thousand, three hundred thirty-three".