171989728 has 24 divisors (see below), whose sum is σ = 340110792. Its totient is φ = 85612416.

The previous prime is 171989707. The next prime is 171989747. The reversal of 171989728 is 827989171.

It is a congruent number.

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, 4575 + ... + 19102.

It is an arithmetic number, because the mean of its divisors is an integer number (14171283).

Almost surely, 2^171989728 is an apocalyptic number.

It is an amenable number.

171989728 is a deficient number, since it is larger than the sum of its proper divisors (168121064).

171989728 is a wasteful number, since it uses less digits than its factorization.

171989728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23914 (or 23906 counting only the distinct ones).

The product of its digits is 508032, while the sum is 52.

The square root of 171989728 is about 13114.4854264283. The cubic root of 171989728 is about 556.1187055692.

The spelling of 171989728 in words is "one hundred seventy-one million, nine hundred eighty-nine thousand, seven hundred twenty-eight".