87818 has 8 divisors (see below), whose sum is σ = 138720. Its totient is φ = 41580.

The previous prime is 87811. The next prime is 87833. The reversal of 87818 is 81878.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×87818² = 15424002248, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (87811) 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, 1118 + ... + 1193.

It is an arithmetic number, because the mean of its divisors is an integer number (17340).

2⁸⁷⁸¹⁸ is an apocalyptic number.

87818 is a deficient number, since it is larger than the sum of its proper divisors (50902).

87818 is a wasteful number, since it uses less digits than its factorization.

87818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2332.

The product of its digits is 3584, while the sum is 32.

The square root of 87818 is about 296.3410197728. The cubic root of 87818 is about 44.4489166796.

The spelling of 87818 in words is "eighty-seven thousand, eight hundred eighteen".