28609333 has 4 divisors (see below), whose sum is σ = 28634508. Its totient is φ = 28584160.

The previous prime is 28609331. The next prime is 28609337. The reversal of 28609333 is 33390682.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4422609 + 24186724 = 2103^2 + 4918^2 .

It is a cyclic number.

It is not a de Polignac number, because 28609333 - 2¹ = 28609331 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 (28609331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10798 + ... + 13183.

It is an arithmetic number, because the mean of its divisors is an integer number (7158627).

Almost surely, 2^28609333 is an apocalyptic number.

It is an amenable number.

28609333 is a deficient number, since it is larger than the sum of its proper divisors (25175).

28609333 is a wasteful number, since it uses less digits than its factorization.

28609333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25174.

The product of its (nonzero) digits is 23328, while the sum is 34.

The square root of 28609333 is about 5348.7692976983. The cubic root of 28609333 is about 305.8458398731.

The spelling of 28609333 in words is "twenty-eight million, six hundred nine thousand, three hundred thirty-three".