28251133 has 4 divisors (see below), whose sum is σ = 29225340. Its totient is φ = 27276928.

The previous prime is 28251109. The next prime is 28251143. The reversal of 28251133 is 33115282.

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 12545764 + 15705369 = 3542^2 + 3963^2 .

It is a cyclic number.

It is not a de Polignac number, because 28251133 - 2⁵ = 28251101 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28251098 and 28251107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28251143) 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, 487060 + ... + 487117.

It is an arithmetic number, because the mean of its divisors is an integer number (7306335).

Almost surely, 2^28251133 is an apocalyptic number.

It is an amenable number.

28251133 is a deficient number, since it is larger than the sum of its proper divisors (974207).

28251133 is an equidigital number, since it uses as much as digits as its factorization.

28251133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 974206.

The product of its digits is 1440, while the sum is 25.

The square root of 28251133 is about 5315.1794889731. The cubic root of 28251133 is about 304.5640389720.

It can be divided in two parts, 282 and 51133, that added together give a palindrome (51415).

The spelling of 28251133 in words is "twenty-eight million, two hundred fifty-one thousand, one hundred thirty-three".