28321116440 has 16 divisors (see below), whose sum is σ = 63722512080. Its totient is φ = 11328446560.

The previous prime is 28321116433. The next prime is 28321116449. The reversal of 28321116440 is 4461112382.

It is a junction number, because it is equal to n+sod(n) for n = 28321116397 and 28321116406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28321116449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 354013916 + ... + 354013995.

It is an arithmetic number, because the mean of its divisors is an integer number (3982657005).

Almost surely, 2^28321116440 is an apocalyptic number.

28321116440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28321116440 is an abundant number, since it is smaller than the sum of its proper divisors (35401395640).

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

28321116440 is a wasteful number, since it uses less digits than its factorization.

28321116440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 708027922 (or 708027918 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The spelling of 28321116440 in words is "twenty-eight billion, three hundred twenty-one million, one hundred sixteen thousand, four hundred forty".