87217 has 4 divisors (see below), whose sum is σ = 93940. Its totient is φ = 80496.

The previous prime is 87211. The next prime is 87221. The reversal of 87217 is 71278.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 33856 + 53361 = 184^2 + 231^2 .

It is not a de Polignac number, because 87217 - 2¹⁵ = 54449 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 87191 and 87200.

It is not an unprimeable number, because it can be changed into a prime (87211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3342 + ... + 3367.

It is an arithmetic number, because the mean of its divisors is an integer number (23485).

2⁸⁷²¹⁷ is an apocalyptic number.

It is an amenable number.

87217 is a deficient number, since it is larger than the sum of its proper divisors (6723).

87217 is a wasteful number, since it uses less digits than its factorization.

87217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6722.

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

The square root of 87217 is about 295.3252444340. The cubic root of 87217 is about 44.3472861403.

It can be divided in two parts, 8 and 7217, that added together give a square (7225 = 85²).

The spelling of 87217 in words is "eighty-seven thousand, two hundred seventeen".