28065218550 has 192 divisors, whose sum is σ = 72401032704. Its totient is φ = 7191244800.

The previous prime is 28065218537. The next prime is 28065218591. The reversal of 28065218550 is 5581256082.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 91417497 + ... + 91417803.

It is an arithmetic number, because the mean of its divisors is an integer number (377088712).

Almost surely, 2^28065218550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28065218550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36200516352).

28065218550 is an abundant number, since it is smaller than the sum of its proper divisors (44335814154).

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

28065218550 is a wasteful number, since it uses less digits than its factorization.

28065218550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 583 (or 578 counting only the distinct ones).

The product of its (nonzero) digits is 192000, while the sum is 42.

The spelling of 28065218550 in words is "twenty-eight billion, sixty-five million, two hundred eighteen thousand, five hundred fifty".