172728369 has 20 divisors (see below), whose sum is σ = 281484720. Its totient is φ = 104683320.

The previous prime is 172728343. The next prime is 172728371. The reversal of 172728369 is 963827271.

172728369 is a `hidden beast` number, since 17 + 272 + 8 + 369 = 666.

It is not a de Polignac number, because 172728369 - 2¹⁷ = 172597297 is a prime.

It is a super-2 number, since 2×172728369² = 59670178914800322, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (172728319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 96039 + ... + 97820.

It is an arithmetic number, because the mean of its divisors is an integer number (14074236).

Almost surely, 2^172728369 is an apocalyptic number.

It is an amenable number.

172728369 is a deficient number, since it is larger than the sum of its proper divisors (108756351).

172728369 is a wasteful number, since it uses less digits than its factorization.

172728369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193882 (or 193873 counting only the distinct ones).

The product of its digits is 254016, while the sum is 45.

The square root of 172728369 is about 13142.6165203128. The cubic root of 172728369 is about 556.9136860517.

The spelling of 172728369 in words is "one hundred seventy-two million, seven hundred twenty-eight thousand, three hundred sixty-nine".