87643 has 2 divisors, whose sum is σ = 87644. Its totient is φ = 87642.
The previous prime is 87641. The next prime is 87649. The reversal of 87643 is 34678.
It is a weak prime.
87643 is a truncatable prime.
It is a cyclic number.
It is not a de Polignac number, because 87643 - 21 = 87641 is a prime.
Together with 87641, it forms a pair of twin primes.
It is a nialpdrome in base 10.
It is not a weakly prime, because it can be changed into another prime (87641) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43821 + 43822.
It is an arithmetic number, because the mean of its divisors is an integer number (43822).
287643 is an apocalyptic number.
87643 is a deficient number, since it is larger than the sum of its proper divisors (1).
87643 is an equidigital number, since it uses as much as digits as its factorization.
87643 is an evil number, because the sum of its binary digits is even.
The product of its digits is 4032, while the sum is 28.
The square root of 87643 is about 296.0456045950. The cubic root of 87643 is about 44.4193717379.
It can be divided in two parts, 876 and 43, that added together give a palindrome (919).
The spelling of 87643 in words is "eighty-seven thousand, six hundred forty-three".
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