28739321984 has 128 divisors (see below), whose sum is σ = 62473057920. Its totient is φ = 13113999360.

The previous prime is 28739321977. The next prime is 28739321999. The reversal of 28739321984 is 48912393782.

It is a tau number, because it is divible by the number of its divisors (128).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39531029 + ... + 39531755.

It is an arithmetic number, because the mean of its divisors is an integer number (488070765).

Almost surely, 2^28739321984 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 28739321984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31236528960).

28739321984 is an abundant number, since it is smaller than the sum of its proper divisors (33733735936).

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

28739321984 is a wasteful number, since it uses less digits than its factorization.

28739321984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1286 (or 1274 counting only the distinct ones).

The product of its digits is 5225472, while the sum is 56.

The spelling of 28739321984 in words is "twenty-eight billion, seven hundred thirty-nine million, three hundred twenty-one thousand, nine hundred eighty-four".