28551710728 has 8 divisors (see below), whose sum is σ = 53534457630. Its totient is φ = 14275855360.

The previous prime is 28551710717. The next prime is 28551710753. The reversal of 28551710728 is 82701715582.

It can be written as a sum of positive squares in only one way, i.e., 16713835524 + 11837875204 = 129282^2 + 108802^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1784481913 + ... + 1784481928.

Almost surely, 2^28551710728 is an apocalyptic number.

It is an amenable number.

28551710728 is a deficient number, since it is larger than the sum of its proper divisors (24982746902).

28551710728 is a wasteful number, since it uses less digits than its factorization.

28551710728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3568963847 (or 3568963843 counting only the distinct ones).

The product of its (nonzero) digits is 313600, while the sum is 46.

The spelling of 28551710728 in words is "twenty-eight billion, five hundred fifty-one million, seven hundred ten thousand, seven hundred twenty-eight".