171081728 has 64 divisors (see below), whose sum is σ = 358607520. Its totient is φ = 81461248.

The previous prime is 171081709. The next prime is 171081749. The reversal of 171081728 is 827180171.

It is a tau number, because it is divible by the number of its divisors (64).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 753551 + ... + 753777.

Almost surely, 2^171081728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 171081728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (179303760).

171081728 is an abundant number, since it is smaller than the sum of its proper divisors (187525792).

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

171081728 is an frugal number, since it uses more digits than its factorization.

171081728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280 (or 252 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 35.

The square root of 171081728 is about 13079.8214055086. The cubic root of 171081728 is about 555.1383233399.

It can be divided in two parts, 1710 and 81728, that added together give a palindrome (83438).

The spelling of 171081728 in words is "one hundred seventy-one million, eighty-one thousand, seven hundred twenty-eight".