28189404244 has 6 divisors (see below), whose sum is σ = 49331457434. Its totient is φ = 14094702120.

The previous prime is 28189404223. The next prime is 28189404281. The reversal of 28189404244 is 44240498182.

It can be written as a sum of positive squares in only one way, i.e., 15361123600 + 12828280644 = 123940^2 + 113262^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28189404194 and 28189404203.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 3523675527 + ... + 3523675534.

Almost surely, 2^28189404244 is an apocalyptic number.

It is an amenable number.

28189404244 is a deficient number, since it is larger than the sum of its proper divisors (21142053190).

28189404244 is a wasteful number, since it uses less digits than its factorization.

28189404244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7047351065 (or 7047351063 counting only the distinct ones).

The product of its (nonzero) digits is 589824, while the sum is 46.

The spelling of 28189404244 in words is "twenty-eight billion, one hundred eighty-nine million, four hundred four thousand, two hundred forty-four".