87689 has 4 divisors (see below), whose sum is σ = 100224. Its totient is φ = 75156.

The previous prime is 87683. The next prime is 87691. The reversal of 87689 is 98678.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 98678 = 2 ⋅49339.

It is a cyclic number.

It is not a de Polignac number, because 87689 - 2⁸ = 87433 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (87683) 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, 6257 + ... + 6270.

It is an arithmetic number, because the mean of its divisors is an integer number (25056).

2⁸⁷⁶⁸⁹ is an apocalyptic number.

It is an amenable number.

87689 is a deficient number, since it is larger than the sum of its proper divisors (12535).

87689 is a wasteful number, since it uses less digits than its factorization.

87689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12534.

The product of its digits is 24192, while the sum is 38.

The square root of 87689 is about 296.1232851364. The cubic root of 87689 is about 44.4271416443.

The spelling of 87689 in words is "eighty-seven thousand, six hundred eighty-nine".