87866 has 4 divisors (see below), whose sum is σ = 131802. Its totient is φ = 43932.

The previous prime is 87853. The next prime is 87869. The reversal of 87866 is 66878.

87866 = 80² + 81² + ... + 91².

87866 is nontrivially palindromic in base 14.

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

It can be written as a sum of positive squares in only one way, i.e., 87025 + 841 = 295^2 + 29^2 .

It is not an unprimeable number, because it can be changed into a prime (87869) by changing a digit.

87866 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21965 + ... + 21968.

2⁸⁷⁸⁶⁶ is an apocalyptic number.

87866 is a deficient number, since it is larger than the sum of its proper divisors (43936).

87866 is a wasteful number, since it uses less digits than its factorization.

87866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43935.

The product of its digits is 16128, while the sum is 35.

The square root of 87866 is about 296.4219964847. The cubic root of 87866 is about 44.4570135747.

The spelling of 87866 in words is "eighty-seven thousand, eight hundred sixty-six".