28128356084 has 12 divisors (see below), whose sum is σ = 49370692644. Its totient is φ = 14022443904.

The previous prime is 28128356083. The next prime is 28128356099. The reversal of 28128356084 is 48065382182.

It can be written as a sum of positive squares in 2 ways, for example, as 12194343184 + 15934012900 = 110428^2 + 126230^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28128356083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10432019 + ... + 10434714.

It is an arithmetic number, because the mean of its divisors is an integer number (4114224387).

Almost surely, 2^28128356084 is an apocalyptic number.

It is an amenable number.

28128356084 is a deficient number, since it is larger than the sum of its proper divisors (21242336560).

28128356084 is a wasteful number, since it uses less digits than its factorization.

28128356084 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20867074 (or 20867072 counting only the distinct ones).

The product of its (nonzero) digits is 737280, while the sum is 47.

The spelling of 28128356084 in words is "twenty-eight billion, one hundred twenty-eight million, three hundred fifty-six thousand, eighty-four".