172170056 has 8 divisors (see below), whose sum is σ = 322818870. Its totient is φ = 86085024.

The previous prime is 172170041. The next prime is 172170059. The reversal of 172170056 is 650071271.

It can be written as a sum of positive squares in only one way, i.e., 144817156 + 27352900 = 12034^2 + 5230^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (172170059) 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 as a sum of consecutive naturals, namely, 10760621 + ... + 10760636.

Almost surely, 2^172170056 is an apocalyptic number.

It is an amenable number.

172170056 is a deficient number, since it is larger than the sum of its proper divisors (150648814).

172170056 is a wasteful number, since it uses less digits than its factorization.

172170056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21521263 (or 21521259 counting only the distinct ones).

The product of its (nonzero) digits is 2940, while the sum is 29.

The square root of 172170056 is about 13121.3587711029. The cubic root of 172170056 is about 556.3129976876.

The spelling of 172170056 in words is "one hundred seventy-two million, one hundred seventy thousand, fifty-six".