87731 has 8 divisors (see below), whose sum is σ = 102144.
Its totient is φ = 73800.
The previous prime is 87721. The next prime is 87739. The reversal of 87731 is 13778.
87731 = T168 + T169 + ... +
It is a sphenic number, since it is the product of 3 distinct primes.
It is a cyclic number.
It is not a de Polignac number, because 87731 - 214 = 71347 is a prime.
It is a super-2 number, since 2×877312 = 15393456722, which contains 22 as substring.
It is a nialpdrome in base 10.
It is a self number, because there is not a number n which added to its sum of digits gives 87731.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (87739) by changing a digit.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 506 + ... + 656.
It is an arithmetic number, because the mean of its divisors is an integer number (12768).
287731 is an apocalyptic number.
87731 is a deficient number, since it is larger than the sum of its proper divisors (14413).
87731 is a wasteful number, since it uses less digits than its factorization.
87731 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 241.
The product of its digits is 1176, while the sum is 26.
The square root of 87731 is about 296.1941930558.
The cubic root of 87731 is about 44.4342335339.
It can be divided in two parts, 87 and 731, that added together give a palindrome (818).
The spelling of 87731 in words is "eighty-seven thousand, seven hundred thirty-one".