28528814591 has 4 divisors (see below), whose sum is σ = 29299863672. Its totient is φ = 27757765512.

The previous prime is 28528814581. The next prime is 28528814623. The reversal of 28528814591 is 19541882582.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28528814591 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 (28528814521) 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, 385524485 + ... + 385524558.

It is an arithmetic number, because the mean of its divisors is an integer number (7324965918).

Almost surely, 2^28528814591 is an apocalyptic number.

28528814591 is a deficient number, since it is larger than the sum of its proper divisors (771049081).

28528814591 is an equidigital number, since it uses as much as digits as its factorization.

28528814591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 771049080.

The product of its digits is 1843200, while the sum is 53.

The spelling of 28528814591 in words is "twenty-eight billion, five hundred twenty-eight million, eight hundred fourteen thousand, five hundred ninety-one".