28188239144 has 16 divisors (see below), whose sum is σ = 56918560020. Its totient is φ = 13009956480.

The previous prime is 28188239119. The next prime is 28188239173. The reversal of 28188239144 is 44193288182.

It can be written as a sum of positive squares in 2 ways, for example, as 27935111044 + 253128100 = 167138^2 + 15910^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28188239092 and 28188239101.

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 in 3 ways as a sum of consecutive naturals, for example, 135520277 + ... + 135520484.

Almost surely, 2^28188239144 is an apocalyptic number.

It is an amenable number.

28188239144 is an abundant number, since it is smaller than the sum of its proper divisors (28730320876).

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

28188239144 is a wasteful number, since it uses less digits than its factorization.

28188239144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271040780 (or 271040776 counting only the distinct ones).

The product of its digits is 884736, while the sum is 50.

The spelling of 28188239144 in words is "twenty-eight billion, one hundred eighty-eight million, two hundred thirty-nine thousand, one hundred forty-four".