85172170 has 32 divisors (see below), whose sum is σ = 157807440. Its totient is φ = 33077760.

The previous prime is 85172167. The next prime is 85172173. The reversal of 85172170 is 7127158.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (85172167) and next prime (85172173).

It can be written as a sum of positive squares in 8 ways, for example, as 19740249 + 65431921 = 4443^2 + 8089^2 .

It is not an unprimeable number, because it can be changed into a prime (85172173) 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, 119776 + ... + 120484.

Almost surely, 2^85172170 is an apocalyptic number.

85172170 is a deficient number, since it is larger than the sum of its proper divisors (72635270).

85172170 is a wasteful number, since it uses less digits than its factorization.

85172170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1050.

The product of its (nonzero) digits is 3920, while the sum is 31.

The square root of 85172170 is about 9228.8769630979. The cubic root of 85172170 is about 439.9796305997.

The spelling of 85172170 in words is "eighty-five million, one hundred seventy-two thousand, one hundred seventy".