71728533729 has 12 divisors (see below), whose sum is σ = 104398783632. Its totient is φ = 47453991000.

The previous prime is 71728533691. The next prime is 71728533731. The reversal of 71728533729 is 92733582717.

71728533729 is a `hidden beast` number, since 7 + 1 + 7 + 285 + 337 + 29 = 666.

It is not a de Polignac number, because 71728533729 - 2¹³ = 71728525537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71728531729) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30418047 + ... + 30420404.

It is an arithmetic number, because the mean of its divisors is an integer number (8699898636).

Almost surely, 2^71728533729 is an apocalyptic number.

It is an amenable number.

71728533729 is a deficient number, since it is larger than the sum of its proper divisors (32670249903).

71728533729 is a wasteful number, since it uses less digits than its factorization.

71728533729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60838588 (or 60838585 counting only the distinct ones).

The product of its digits is 4445280, while the sum is 54.

The spelling of 71728533729 in words is "seventy-one billion, seven hundred twenty-eight million, five hundred thirty-three thousand, seven hundred twenty-nine".