87566 has 4 divisors (see below), whose sum is σ = 131352. Its totient is φ = 43782.

The previous prime is 87559. The next prime is 87583. The reversal of 87566 is 66578.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66578 = 2 ⋅33289.

It is a congruent number.

It is an unprimeable number.

87566 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, 21890 + ... + 21893.

It is an arithmetic number, because the mean of its divisors is an integer number (32838).

2⁸⁷⁵⁶⁶ is an apocalyptic number.

87566 is a deficient number, since it is larger than the sum of its proper divisors (43786).

87566 is a wasteful number, since it uses less digits than its factorization.

87566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43785.

The product of its digits is 10080, while the sum is 32.

The square root of 87566 is about 295.9155284874. The cubic root of 87566 is about 44.4063595035.

The spelling of 87566 in words is "eighty-seven thousand, five hundred sixty-six".