28848181 has 4 divisors (see below), whose sum is σ = 29321164. Its totient is φ = 28375200.

The previous prime is 28848179. The next prime is 28848191. The reversal of 28848181 is 18184882.

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 6200100 + 22648081 = 2490^2 + 4759^2 .

It is a cyclic number.

It is not a de Polignac number, because 28848181 - 2¹ = 28848179 is a prime.

It is a super-2 number, since 2×28848181² = 1664435094017522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28848121) 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, 236400 + ... + 236521.

It is an arithmetic number, because the mean of its divisors is an integer number (7330291).

Almost surely, 2^28848181 is an apocalyptic number.

It is an amenable number.

28848181 is a deficient number, since it is larger than the sum of its proper divisors (472983).

28848181 is an equidigital number, since it uses as much as digits as its factorization.

28848181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 472982.

The product of its digits is 32768, while the sum is 40.

The square root of 28848181 is about 5371.0502697331. The cubic root of 28848181 is about 306.6946108489.

The spelling of 28848181 in words is "twenty-eight million, eight hundred forty-eight thousand, one hundred eighty-one".