28765133 has 4 divisors (see below), whose sum is σ = 28781340. Its totient is φ = 28748928.

The previous prime is 28765097. The next prime is 28765141. The reversal of 28765133 is 33156782.

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 28590409 + 174724 = 5347^2 + 418^2 .

It is a cyclic number.

It is not a de Polignac number, because 28765133 - 2⁸ = 28764877 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28765093 and 28765102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28765733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5060 + ... + 9117.

It is an arithmetic number, because the mean of its divisors is an integer number (7195335).

Almost surely, 2^28765133 is an apocalyptic number.

It is an amenable number.

28765133 is a deficient number, since it is larger than the sum of its proper divisors (16207).

28765133 is a wasteful number, since it uses less digits than its factorization.

28765133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16206.

The product of its digits is 30240, while the sum is 35.

The square root of 28765133 is about 5363.3136212606. The cubic root of 28765133 is about 306.4000243429.

The spelling of 28765133 in words is "twenty-eight million, seven hundred sixty-five thousand, one hundred thirty-three".