28289324672 has 64 divisors (see below), whose sum is σ = 64563307200. Its totient is φ = 12094900224.

The previous prime is 28289324647. The next prime is 28289324699. The reversal of 28289324672 is 27642398282.

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

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 337748 + ... + 413100.

It is an arithmetic number, because the mean of its divisors is an integer number (1008801675).

Almost surely, 2^28289324672 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 28289324672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32281653600).

28289324672 is an abundant number, since it is smaller than the sum of its proper divisors (36273982528).

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

28289324672 is an equidigital number, since it uses as much as digits as its factorization.

28289324672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75793 (or 75781 counting only the distinct ones).

The product of its digits is 4644864, while the sum is 53.

The spelling of 28289324672 in words is "twenty-eight billion, two hundred eighty-nine million, three hundred twenty-four thousand, six hundred seventy-two".