81584 has 10 divisors (see below), whose sum is σ = 158100. Its totient is φ = 40784.
The previous prime is 81569. The next prime is 81611. The reversal of 81584 is 48518.
It is an unprimeable number.
81584 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, 2534 + ... + 2565.
It is an arithmetic number, because the mean of its divisors is an integer number (15810).
281584 is an apocalyptic number.
It is an amenable number.
81584 is a deficient number, since it is larger than the sum of its proper divisors (76516).
81584 is a wasteful number, since it uses less digits than its factorization.
81584 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 5107 (or 5101 counting only the distinct ones).
The product of its digits is 1280, while the sum is 26.
The square root of 81584 is about 285.6291301671. The cubic root of 81584 is about 43.3712226140.
The spelling of 81584 in words is "eighty-one thousand, five hundred eighty-four".
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