28601745728 has 28 divisors (see below), whose sum is σ = 57534086100. Its totient is φ = 14104968192.

The previous prime is 28601745721. The next prime is 28601745787. The reversal of 28601745728 is 82754710682.

It can be written as a sum of positive squares in 2 ways, for example, as 6235945024 + 22365800704 = 78968^2 + 149552^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28601745721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3056303 + ... + 3065646.

Almost surely, 2^28601745728 is an apocalyptic number.

It is an amenable number.

28601745728 is an abundant number, since it is smaller than the sum of its proper divisors (28932340372).

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

28601745728 is an equidigital number, since it uses as much as digits as its factorization.

28601745728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6122034 (or 6122024 counting only the distinct ones).

The product of its (nonzero) digits is 1505280, while the sum is 50.

The spelling of 28601745728 in words is "twenty-eight billion, six hundred one million, seven hundred forty-five thousand, seven hundred twenty-eight".