87787 has 4 divisors (see below), whose sum is σ = 100336. Its totient is φ = 75240.

The previous prime is 87767. The next prime is 87793. The reversal of 87787 is 78778.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6264 + ... + 6277.

It is an arithmetic number, because the mean of its divisors is an integer number (25084).

2⁸⁷⁷⁸⁷ is an apocalyptic number.

87787 is a deficient number, since it is larger than the sum of its proper divisors (12549).

87787 is a wasteful number, since it uses less digits than its factorization.

87787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12548.

The product of its digits is 21952, while the sum is 37.

The square root of 87787 is about 296.2887105510. The cubic root of 87787 is about 44.4436858667.

Subtracting from 87787 its reverse (78778), we obtain a palindrome (9009).

The spelling of 87787 in words is "eighty-seven thousand, seven hundred eighty-seven".