28591922840 has 128 divisors (see below), whose sum is σ = 73107619200. Its totient is φ = 9984184320.

The previous prime is 28591922833. The next prime is 28591922881. The reversal of 28591922840 is 4822919582.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1051010 + ... + 1077870.

It is an arithmetic number, because the mean of its divisors is an integer number (571153275).

Almost surely, 2^28591922840 is an apocalyptic number.

28591922840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28591922840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36553809600).

28591922840 is an abundant number, since it is smaller than the sum of its proper divisors (44515696360).

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

28591922840 is a wasteful number, since it uses less digits than its factorization.

28591922840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26997 (or 26993 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 50.

The spelling of 28591922840 in words is "twenty-eight billion, five hundred ninety-one million, nine hundred twenty-two thousand, eight hundred forty".