28087304513 has 4 divisors (see below), whose sum is σ = 28211037360. Its totient is φ = 27963571668.

The previous prime is 28087304491. The next prime is 28087304533. The reversal of 28087304513 is 31540378082.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31540378082 = 2 ⋅15770189041.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28087304513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28087304533) 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, 61866083 + ... + 61866536.

It is an arithmetic number, because the mean of its divisors is an integer number (7052759340).

Almost surely, 2^28087304513 is an apocalyptic number.

It is an amenable number.

28087304513 is a deficient number, since it is larger than the sum of its proper divisors (123732847).

28087304513 is a wasteful number, since it uses less digits than its factorization.

28087304513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123732846.

The product of its (nonzero) digits is 161280, while the sum is 41.

The spelling of 28087304513 in words is "twenty-eight billion, eighty-seven million, three hundred four thousand, five hundred thirteen".