87172 has 24 divisors (see below), whose sum is σ = 170240. Its totient is φ = 38880.

The previous prime is 87151. The next prime is 87179. The reversal of 87172 is 27178.

It is a happy number.

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

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2338 + ... + 2374.

2⁸⁷¹⁷² is an apocalyptic number.

87172 is the 148-th decagonal number.

It is an amenable number.

87172 is a deficient number, since it is larger than the sum of its proper divisors (83068).

87172 is a wasteful number, since it uses less digits than its factorization.

87172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91 (or 89 counting only the distinct ones).

The product of its digits is 784, while the sum is 25.

The square root of 87172 is about 295.2490474159. The cubic root of 87172 is about 44.3396577682.

The spelling of 87172 in words is "eighty-seven thousand, one hundred seventy-two".