81832585 has 8 divisors (see below), whose sum is σ = 98251776. Its totient is φ = 65430960.

The previous prime is 81832561. The next prime is 81832603. The reversal of 81832585 is 58523818.

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

It is not a de Polignac number, because 81832585 - 2⁹ = 81832073 is a prime.

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

It is a Duffinian 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, 10390 + ... + 16480.

It is an arithmetic number, because the mean of its divisors is an integer number (12281472).

Almost surely, 2^81832585 is an apocalyptic number.

It is an amenable number.

81832585 is a deficient number, since it is larger than the sum of its proper divisors (16419191).

81832585 is a wasteful number, since it uses less digits than its factorization.

81832585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8783.

The product of its digits is 76800, while the sum is 40.

The square root of 81832585 is about 9046.1364681283. The cubic root of 81832585 is about 434.1522839774.

The spelling of 81832585 in words is "eighty-one million, eight hundred thirty-two thousand, five hundred eighty-five".