28528814593 has 4 divisors (see below), whose sum is σ = 28545090628. Its totient is φ = 28512538560.

The previous prime is 28528814581. The next prime is 28528814623. The reversal of 28528814593 is 39541882582.

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 13246168464 + 15282646129 = 115092^2 + 123623^2 .

It is a cyclic number.

It is not a de Polignac number, because 28528814593 - 2²¹ = 28526717441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28528814513) 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, 8135388 + ... + 8138893.

It is an arithmetic number, because the mean of its divisors is an integer number (7136272657).

Almost surely, 2^28528814593 is an apocalyptic number.

It is an amenable number.

28528814593 is a deficient number, since it is larger than the sum of its proper divisors (16276035).

28528814593 is a wasteful number, since it uses less digits than its factorization.

28528814593 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16276034.

The product of its digits is 5529600, while the sum is 55.

The spelling of 28528814593 in words is "twenty-eight billion, five hundred twenty-eight million, eight hundred fourteen thousand, five hundred ninety-three".