81584713 has 8 divisors (see below), whose sum is σ = 93340160. Its totient is φ = 69854400.

The previous prime is 81584693. The next prime is 81584729. The reversal of 81584713 is 31748518.

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

It is not a de Polignac number, because 81584713 - 2⁵ = 81584681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81584753) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1288 + ... + 12838.

It is an arithmetic number, because the mean of its divisors is an integer number (11667520).

Almost surely, 2^81584713 is an apocalyptic number.

It is an amenable number.

81584713 is a deficient number, since it is larger than the sum of its proper divisors (11755447).

81584713 is a wasteful number, since it uses less digits than its factorization.

81584713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12567.

The product of its digits is 26880, while the sum is 37.

The square root of 81584713 is about 9032.4256432035. The cubic root of 81584713 is about 433.7134896060.

The spelling of 81584713 in words is "eighty-one million, five hundred eighty-four thousand, seven hundred thirteen".