172156056 has 32 divisors (see below), whose sum is σ = 430928640. Its totient is φ = 57313568.

The previous prime is 172155983. The next prime is 172156057. The reversal of 172156056 is 650651271.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172156057) 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 7 ways as a sum of consecutive naturals, for example, 17245 + ... + 25331.

It is an arithmetic number, because the mean of its divisors is an integer number (13466520).

Almost surely, 2^172156056 is an apocalyptic number.

It is an amenable number.

172156056 is an abundant number, since it is smaller than the sum of its proper divisors (258772584).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

172156056 is a wasteful number, since it uses less digits than its factorization.

172156056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8983 (or 8979 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 33.

The square root of 172156056 is about 13120.8252789221. The cubic root of 172156056 is about 556.2979184238.

The spelling of 172156056 in words is "one hundred seventy-two million, one hundred fifty-six thousand, fifty-six".