172124872 has 16 divisors (see below), whose sum is σ = 330240240. Its totient is φ = 84060816.

The previous prime is 172124833. The next prime is 172124899. The reversal of 172124872 is 278421271.

It is a happy number.

It is a super-4 number, since 4×172124872⁴ (a number of 34 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 249838 + ... + 250525.

It is an arithmetic number, because the mean of its divisors is an integer number (20640015).

Almost surely, 2^172124872 is an apocalyptic number.

It is an amenable number.

172124872 is a deficient number, since it is larger than the sum of its proper divisors (158115368).

172124872 is a wasteful number, since it uses less digits than its factorization.

172124872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 500412 (or 500408 counting only the distinct ones).

The product of its digits is 12544, while the sum is 34.

The square root of 172124872 is about 13119.6368852190. The cubic root of 172124872 is about 556.2643275020.

The spelling of 172124872 in words is "one hundred seventy-two million, one hundred twenty-four thousand, eight hundred seventy-two".