28017605512 has 144 divisors (see below), whose sum is σ = 60451389180. Its totient is φ = 12160512000.

The previous prime is 28017605507. The next prime is 28017605519. The reversal of 28017605512 is 21550671082.

It can be written as a sum of positive squares in 18 ways, for example, as 5543398116 + 22474207396 = 74454^2 + 149914^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28017605519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 46618012 + ... + 46618612.

Almost surely, 2^28017605512 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28017605512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30225694590).

28017605512 is an abundant number, since it is smaller than the sum of its proper divisors (32433783668).

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

28017605512 is a wasteful number, since it uses less digits than its factorization.

28017605512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 732 (or 686 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 37.

The spelling of 28017605512 in words is "twenty-eight billion, seventeen million, six hundred five thousand, five hundred twelve".