87823 has 4 divisors (see below), whose sum is σ = 90688. Its totient is φ = 84960.

The previous prime is 87811. The next prime is 87833. The reversal of 87823 is 32878.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 87823 - 2¹³ = 79631 is a prime.

It is a Duffinian number.

87823 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 87791 and 87800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87803) 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, 1386 + ... + 1447.

It is an arithmetic number, because the mean of its divisors is an integer number (22672).

2⁸⁷⁸²³ is an apocalyptic number.

87823 is a deficient number, since it is larger than the sum of its proper divisors (2865).

87823 is a wasteful number, since it uses less digits than its factorization.

87823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2864.

The product of its digits is 2688, while the sum is 28.

The square root of 87823 is about 296.3494558794. The cubic root of 87823 is about 44.4497602438.

Subtracting from 87823 its reverse (32878), we obtain a palindrome (54945).

The spelling of 87823 in words is "eighty-seven thousand, eight hundred twenty-three".