28068885 has 24 divisors (see below), whose sum is σ = 52396344. Its totient is φ = 13818240.

The previous prime is 28068881. The next prime is 28068889. The reversal of 28068885 is 58886082.

It is an interprime number because it is at equal distance from previous prime (28068881) and next prime (28068889).

It can be written as a sum of positive squares in 4 ways, for example, as 81 + 28068804 = 9^2 + 5298^2 .

It is not a de Polignac number, because 28068885 - 2² = 28068881 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 28068885.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28068881) 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 23 ways as a sum of consecutive naturals, for example, 23406 + ... + 24575.

It is an arithmetic number, because the mean of its divisors is an integer number (2183181).

Almost surely, 2^28068885 is an apocalyptic number.

It is an amenable number.

28068885 is a deficient number, since it is larger than the sum of its proper divisors (24327459).

28068885 is a wasteful number, since it uses less digits than its factorization.

28068885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48005 (or 48002 counting only the distinct ones).

The product of its (nonzero) digits is 245760, while the sum is 45.

The square root of 28068885 is about 5298.0076443886. The cubic root of 28068885 is about 303.9077116270.

The spelling of 28068885 in words is "twenty-eight million, sixty-eight thousand, eight hundred eighty-five".