28321044840 has 96 divisors (see below), whose sum is σ = 100410991200. Its totient is φ = 6865706880.

The previous prime is 28321044827. The next prime is 28321044859. The reversal of 28321044840 is 4844012382.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 28321044795 and 28321044804.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3571930 + ... + 3579849.

It is an arithmetic number, because the mean of its divisors is an integer number (1045947825).

Almost surely, 2^28321044840 is an apocalyptic number.

28321044840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28321044840 is an abundant number, since it is smaller than the sum of its proper divisors (72089946360).

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

28321044840 is a wasteful number, since it uses less digits than its factorization.

28321044840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7151807 (or 7151800 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 36.

The spelling of 28321044840 in words is "twenty-eight billion, three hundred twenty-one million, forty-four thousand, eight hundred forty".