28259492856 has 128 divisors (see below), whose sum is σ = 82985280000. Its totient is φ = 8015728896.

The previous prime is 28259492839. The next prime is 28259492857. The reversal of 28259492856 is 65829495282.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 28259492856.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28259492857) 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, 1131900 + ... + 1156596.

It is an arithmetic number, because the mean of its divisors is an integer number (648322500).

Almost surely, 2^28259492856 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 28259492856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41492640000).

28259492856 is an abundant number, since it is smaller than the sum of its proper divisors (54725787144).

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

28259492856 is a wasteful number, since it uses less digits than its factorization.

28259492856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24866 (or 24848 counting only the distinct ones).

The product of its digits is 24883200, while the sum is 60.

The spelling of 28259492856 in words is "twenty-eight billion, two hundred fifty-nine million, four hundred ninety-two thousand, eight hundred fifty-six".