28389021696 has 384 divisors, whose sum is σ = 97556659200. Its totient is φ = 7989166080.

The previous prime is 28389021679. The next prime is 28389021697. The reversal of 28389021696 is 69612098382.

It is a tau number, because it is divible by the number of its divisors (384).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28389021697) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27481596 + ... + 27482628.

It is an arithmetic number, because the mean of its divisors is an integer number (254053800).

Almost surely, 2^28389021696 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 28389021696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48778329600).

28389021696 is an abundant number, since it is smaller than the sum of its proper divisors (69167637504).

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

28389021696 is a wasteful number, since it uses less digits than its factorization.

28389021696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1142 (or 1116 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 54.

The spelling of 28389021696 in words is "twenty-eight billion, three hundred eighty-nine million, twenty-one thousand, six hundred ninety-six".