28534825991 has 8 divisors (see below), whose sum is σ = 33024030720. Its totient is φ = 24148821528.

The previous prime is 28534825987. The next prime is 28534826027. The reversal of 28534825991 is 19952843582.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28534825991 - 2² = 28534825987 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 (28534845991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25799471 + ... + 25800576.

It is an arithmetic number, because the mean of its divisors is an integer number (4128003840).

Almost surely, 2^28534825991 is an apocalyptic number.

28534825991 is a deficient number, since it is larger than the sum of its proper divisors (4489204729).

28534825991 is an equidigital number, since it uses as much as digits as its factorization.

28534825991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51600133.

The product of its digits is 6220800, while the sum is 56.

The spelling of 28534825991 in words is "twenty-eight billion, five hundred thirty-four million, eight hundred twenty-five thousand, nine hundred ninety-one".