28185433 has 4 divisors (see below), whose sum is σ = 28196260. Its totient is φ = 28174608.

The previous prime is 28185431. The next prime is 28185457. The reversal of 28185433 is 33458182.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 16875664 + 11309769 = 4108^2 + 3363^2 .

It is a cyclic number.

It is not a de Polignac number, because 28185433 - 2¹ = 28185431 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28185431) 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, 1123 + ... + 7591.

It is an arithmetic number, because the mean of its divisors is an integer number (7049065).

Almost surely, 2^28185433 is an apocalyptic number.

It is an amenable number.

28185433 is a deficient number, since it is larger than the sum of its proper divisors (10827).

28185433 is an equidigital number, since it uses as much as digits as its factorization.

28185433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10826.

The product of its digits is 23040, while the sum is 34.

The square root of 28185433 is about 5308.9954793727. The cubic root of 28185433 is about 304.3277606739.

The spelling of 28185433 in words is "twenty-eight million, one hundred eighty-five thousand, four hundred thirty-three".