28093427585 has 4 divisors (see below), whose sum is σ = 33712113108. Its totient is φ = 22474742064.

The previous prime is 28093427581. The next prime is 28093427587. The reversal of 28093427585 is 58572439082.

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 7935959056 + 20157468529 = 89084^2 + 141977^2 .

It is a cyclic number.

It is not a de Polignac number, because 28093427585 - 2² = 28093427581 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28093427581) 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, 2809342754 + ... + 2809342763.

It is an arithmetic number, because the mean of its divisors is an integer number (8428028277).

Almost surely, 2^28093427585 is an apocalyptic number.

It is an amenable number.

28093427585 is a deficient number, since it is larger than the sum of its proper divisors (5618685523).

28093427585 is an equidigital number, since it uses as much as digits as its factorization.

28093427585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5618685522.

The product of its (nonzero) digits is 4838400, while the sum is 53.

The spelling of 28093427585 in words is "twenty-eight billion, ninety-three million, four hundred twenty-seven thousand, five hundred eighty-five".