87170 has 16 divisors (see below), whose sum is σ = 164160. Its totient is φ = 33264.

The previous prime is 87151. The next prime is 87179. The reversal of 87170 is 7178.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is not an unprimeable number, because it can be changed into a prime (87179) by changing a digit.

87170 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41 + ... + 419.

It is an arithmetic number, because the mean of its divisors is an integer number (10260).

2⁸⁷¹⁷⁰ is an apocalyptic number.

87170 is a deficient number, since it is larger than the sum of its proper divisors (76990).

87170 is a wasteful number, since it uses less digits than its factorization.

87170 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409.

The product of its (nonzero) digits is 392, while the sum is 23.

The square root of 87170 is about 295.2456604253. The cubic root of 87170 is about 44.3393186685.

The spelling of 87170 in words is "eighty-seven thousand, one hundred seventy".