87859 has 4 divisors (see below), whose sum is σ = 88816. Its totient is φ = 86904.

The previous prime is 87853. The next prime is 87869. The reversal of 87859 is 95878.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 95878 = 2 ⋅47939.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87853) 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, 324 + ... + 529.

It is an arithmetic number, because the mean of its divisors is an integer number (22204).

2⁸⁷⁸⁵⁹ is an apocalyptic number.

87859 is a deficient number, since it is larger than the sum of its proper divisors (957).

87859 is a wasteful number, since it uses less digits than its factorization.

87859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 956.

The product of its digits is 20160, while the sum is 37.

The square root of 87859 is about 296.4101887588. The cubic root of 87859 is about 44.4558329612.

It can be divided in two parts, 87 and 859, that added together give a triangular number (946 = T₄₃).

The spelling of 87859 in words is "eighty-seven thousand, eight hundred fifty-nine".