91735728669728 has 48 divisors (see below), whose sum is σ = 212178966846336. Its totient is φ = 38490515523840.

The previous prime is 91735728669643. The next prime is 91735728669757. The reversal of 91735728669728 is 82796682753719.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10023567176 + ... + 10023576327.

It is an arithmetic number, because the mean of its divisors is an integer number (4420395142632).

Almost surely, 2^{91735728669728} is an apocalyptic number.

It is an amenable number.

91735728669728 is an abundant number, since it is smaller than the sum of its proper divisors (120443238176608).

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

91735728669728 is a wasteful number, since it uses less digits than its factorization.

91735728669728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20047143537 (or 20047143529 counting only the distinct ones).

The product of its digits is 3840721920, while the sum is 80.

The spelling of 91735728669728 in words is "ninety-one trillion, seven hundred thirty-five billion, seven hundred twenty-eight million, six hundred sixty-nine thousand, seven hundred twenty-eight".