28088057 has 4 divisors (see below), whose sum is σ = 28098660. Its totient is φ = 28077456.

The previous prime is 28088051. The next prime is 28088059. The reversal of 28088057 is 75088082.

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 14167696 + 13920361 = 3764^2 + 3731^2 .

It is a cyclic number.

It is not a de Polignac number, because 28088057 - 2⁴ = 28088041 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28088057.

It is not an unprimeable number, because it can be changed into a prime (28088051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2483 + ... + 7895.

It is an arithmetic number, because the mean of its divisors is an integer number (7024665).

Almost surely, 2^28088057 is an apocalyptic number.

It is an amenable number.

28088057 is a deficient number, since it is larger than the sum of its proper divisors (10603).

28088057 is an equidigital number, since it uses as much as digits as its factorization.

28088057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10602.

The product of its (nonzero) digits is 35840, while the sum is 38.

The square root of 28088057 is about 5299.8166949433. The cubic root of 28088057 is about 303.9768889691.

The spelling of 28088057 in words is "twenty-eight million, eighty-eight thousand, fifty-seven".