28504244225 has 6 divisors (see below), whose sum is σ = 35345262870. Its totient is φ = 22803395360.

The previous prime is 28504244221. The next prime is 28504244257. The reversal of 28504244225 is 52244240582.

It is a Cunningham number, because it is equal to 168832²+1.

It can be written as a sum of positive squares in 3 ways, for example, as 1 + 28504244224 = 1^2 + 168832^2 .

It is not a de Polignac number, because 28504244225 - 2² = 28504244221 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28504244221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 570084860 + ... + 570084909.

It is an arithmetic number, because the mean of its divisors is an integer number (5890877145).

Almost surely, 2^28504244225 is an apocalyptic number.

28504244225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28504244225 is a deficient number, since it is larger than the sum of its proper divisors (6841018645).

28504244225 is a wasteful number, since it uses less digits than its factorization.

28504244225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1140169779 (or 1140169774 counting only the distinct ones).

The product of its (nonzero) digits is 204800, while the sum is 38.

The spelling of 28504244225 in words is "twenty-eight billion, five hundred four million, two hundred forty-four thousand, two hundred twenty-five".