81896585 has 8 divisors (see below), whose sum is σ = 99050496. Its totient is φ = 65000880.

The previous prime is 81896569. The next prime is 81896597. The reversal of 81896585 is 58569818.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81896585 - 2⁴ = 81896569 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 63851 + ... + 65120.

It is an arithmetic number, because the mean of its divisors is an integer number (12381312).

Almost surely, 2^81896585 is an apocalyptic number.

It is an amenable number.

81896585 is a deficient number, since it is larger than the sum of its proper divisors (17153911).

81896585 is a wasteful number, since it uses less digits than its factorization.

81896585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129103.

The product of its digits is 691200, while the sum is 50.

The square root of 81896585 is about 9049.6731985194. The cubic root of 81896585 is about 434.2654357483.

The spelling of 81896585 in words is "eighty-one million, eight hundred ninety-six thousand, five hundred eighty-five".