28859686528 has 64 divisors (see below), whose sum is σ = 58262675400. Its totient is φ = 14238056448.

The previous prime is 28859686439. The next prime is 28859686547. The reversal of 28859686528 is 82568695882.

It can be written as a sum of positive squares in 4 ways, for example, as 28199813184 + 659873344 = 167928^2 + 25688^2 .

It is a tau number, because it is divible by the number of its divisors (64).

It is an unprimeable number.

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, 3307900 + ... + 3316612.

Almost surely, 2^28859686528 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28859686528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29131337700).

28859686528 is an abundant number, since it is smaller than the sum of its proper divisors (29402988872).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28859686528 is a wasteful number, since it uses less digits than its factorization.

28859686528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9069 (or 9057 counting only the distinct ones).

The product of its digits is 132710400, while the sum is 67.

The spelling of 28859686528 in words is "twenty-eight billion, eight hundred fifty-nine million, six hundred eighty-six thousand, five hundred twenty-eight".