28556234887 has 8 divisors (see below), whose sum is σ = 28987918832. Its totient is φ = 28124712000.

The previous prime is 28556234831. The next prime is 28556234923. The reversal of 28556234887 is 78843265582.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28556234887 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 (28556034887) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 344587 + ... + 419347.

It is an arithmetic number, because the mean of its divisors is an integer number (3623489854).

Almost surely, 2^28556234887 is an apocalyptic number.

28556234887 is a deficient number, since it is larger than the sum of its proper divisors (431683945).

28556234887 is an equidigital number, since it uses as much as digits as its factorization.

28556234887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80529.

The product of its digits is 25804800, while the sum is 58.

The spelling of 28556234887 in words is "twenty-eight billion, five hundred fifty-six million, two hundred thirty-four thousand, eight hundred eighty-seven".