172106685 has 24 divisors (see below), whose sum is σ = 298629240. Its totient is φ = 91694592.

The previous prime is 172106653. The next prime is 172106713. The reversal of 172106685 is 586601271.

It can be written as a sum of positive squares in 4 ways, for example, as 52794756 + 119311929 = 7266^2 + 10923^2 .

It is not a de Polignac number, because 172106685 - 2⁵ = 172106653 is a prime.

It is a super-2 number, since 2×172106685² = 59241422043378450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 71217 + ... + 73593.

It is an arithmetic number, because the mean of its divisors is an integer number (12442885).

Almost surely, 2^172106685 is an apocalyptic number.

172106685 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

172106685 is a deficient number, since it is larger than the sum of its proper divisors (126522555).

172106685 is a wasteful number, since it uses less digits than its factorization.

172106685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3997 (or 3994 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 172106685 is about 13118.9437455917. The cubic root of 172106685 is about 556.2447348742.

The spelling of 172106685 in words is "one hundred seventy-two million, one hundred six thousand, six hundred eighty-five".