28087093 has 4 divisors (see below), whose sum is σ = 28102828. Its totient is φ = 28071360.

The previous prime is 28087063. The next prime is 28087099. The reversal of 28087093 is 39078082.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39078082 = 2 ⋅19539041.

It can be written as a sum of positive squares in 2 ways, for example, as 21316689 + 6770404 = 4617^2 + 2602^2 .

It is a cyclic number.

It is not a de Polignac number, because 28087093 - 2⁵ = 28087061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28087099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4788 + ... + 8893.

It is an arithmetic number, because the mean of its divisors is an integer number (7025707).

Almost surely, 2^28087093 is an apocalyptic number.

It is an amenable number.

28087093 is a deficient number, since it is larger than the sum of its proper divisors (15735).

28087093 is a wasteful number, since it uses less digits than its factorization.

28087093 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15734.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 28087093 is about 5299.7257476213. The cubic root of 28087093 is about 303.9734113692.

The spelling of 28087093 in words is "twenty-eight million, eighty-seven thousand, ninety-three".