28988587585 has 4 divisors (see below), whose sum is σ = 34786305108. Its totient is φ = 23190870064.

The previous prime is 28988587499. The next prime is 28988587597. The reversal of 28988587585 is 58578588982.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58578588982 = 2 ⋅29289294491.

It can be written as a sum of positive squares in 2 ways, for example, as 13636634176 + 15351953409 = 116776^2 + 123903^2 .

It is a cyclic number.

It is not a de Polignac number, because 28988587585 - 2¹⁵ = 28988554817 is a prime.

It is a super-2 number, since 2×28988587585² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2898858754 + ... + 2898858763.

It is an arithmetic number, because the mean of its divisors is an integer number (8696576277).

Almost surely, 2^28988587585 is an apocalyptic number.

It is an amenable number.

28988587585 is a deficient number, since it is larger than the sum of its proper divisors (5797717523).

28988587585 is an equidigital number, since it uses as much as digits as its factorization.

28988587585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5797717522.

The product of its digits is 516096000, while the sum is 73.

The spelling of 28988587585 in words is "twenty-eight billion, nine hundred eighty-eight million, five hundred eighty-seven thousand, five hundred eighty-five".