171728881 has 8 divisors (see below), whose sum is σ = 174864960. Its totient is φ = 168600432.

The previous prime is 171728867. The next prime is 171728899. The reversal of 171728881 is 188827171.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 171728881 - 2¹⁷ = 171597809 is a prime.

It is a super-2 number, since 2×171728881² = 58981617139024322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (171728831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63156 + ... + 65818.

It is an arithmetic number, because the mean of its divisors is an integer number (21858120).

Almost surely, 2^171728881 is an apocalyptic number.

It is an amenable number.

171728881 is a deficient number, since it is larger than the sum of its proper divisors (3136079).

171728881 is a wasteful number, since it uses less digits than its factorization.

171728881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3815.

The product of its digits is 50176, while the sum is 43.

The square root of 171728881 is about 13104.5366572039. The cubic root of 171728881 is about 555.8374188218.

The spelling of 171728881 in words is "one hundred seventy-one million, seven hundred twenty-eight thousand, eight hundred eighty-one".