172180085 has 16 divisors (see below), whose sum is σ = 257599872. Its totient is φ = 107332800.

The previous prime is 172180081. The next prime is 172180087. The reversal of 172180085 is 580081271.

It is a happy number.

It is not a de Polignac number, because 172180085 - 2² = 172180081 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172180081) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 223226 + ... + 223995.

It is an arithmetic number, because the mean of its divisors is an integer number (16099992).

Almost surely, 2^172180085 is an apocalyptic number.

It is an amenable number.

172180085 is a deficient number, since it is larger than the sum of its proper divisors (85419787).

172180085 is a wasteful number, since it uses less digits than its factorization.

172180085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 447244.

The product of its (nonzero) digits is 4480, while the sum is 32.

The square root of 172180085 is about 13121.7409287030. The cubic root of 172180085 is about 556.3237993234.

The spelling of 172180085 in words is "one hundred seventy-two million, one hundred eighty thousand, eighty-five".