28288808540 has 96 divisors (see below), whose sum is σ = 64274091840. Its totient is φ = 10423296000.

The previous prime is 28288808473. The next prime is 28288808551. The reversal of 28288808540 is 4580888282.

It is a super-4 number, since 4×28288808540⁴ (a number of 43 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

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, 4873640 + ... + 4879440.

It is an arithmetic number, because the mean of its divisors is an integer number (669521790).

Almost surely, 2^28288808540 is an apocalyptic number.

28288808540 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 28288808540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32137045920).

28288808540 is an abundant number, since it is smaller than the sum of its proper divisors (35985283300).

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

28288808540 is a wasteful number, since it uses less digits than its factorization.

28288808540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6183 (or 6181 counting only the distinct ones).

The product of its (nonzero) digits is 2621440, while the sum is 53.

The spelling of 28288808540 in words is "twenty-eight billion, two hundred eighty-eight million, eight hundred eight thousand, five hundred forty".