28225785188 has 6 divisors (see below), whose sum is σ = 49395124086. Its totient is φ = 14112892592.

The previous prime is 28225785149. The next prime is 28225785193. The reversal of 28225785188 is 88158752282.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 14774888704 + 13450896484 = 121552^2 + 115978^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3528223145 + ... + 3528223152.

It is an arithmetic number, because the mean of its divisors is an integer number (8232520681).

Almost surely, 2^28225785188 is an apocalyptic number.

It is an amenable number.

28225785188 is a deficient number, since it is larger than the sum of its proper divisors (21169338898).

28225785188 is a wasteful number, since it uses less digits than its factorization.

28225785188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7056446301 (or 7056446299 counting only the distinct ones).

The product of its digits is 5734400, while the sum is 56.

The spelling of 28225785188 in words is "twenty-eight billion, two hundred twenty-five million, seven hundred eighty-five thousand, one hundred eighty-eight".