81585342 has 24 divisors (see below), whose sum is σ = 178594416. Its totient is φ = 26914176.

The previous prime is 81585313. The next prime is 81585349. The reversal of 81585342 is 24358518.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 81585297 and 81585306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81585349) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21618 + ... + 25109.

It is an arithmetic number, because the mean of its divisors is an integer number (7441434).

Almost surely, 2^81585342 is an apocalyptic number.

81585342 is an abundant number, since it is smaller than the sum of its proper divisors (97009074).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81585342 is a wasteful number, since it uses less digits than its factorization.

81585342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46832 (or 46829 counting only the distinct ones).

The product of its digits is 38400, while the sum is 36.

The square root of 81585342 is about 9032.4604621332. The cubic root of 81585342 is about 433.7146042146.

The spelling of 81585342 in words is "eighty-one million, five hundred eighty-five thousand, three hundred forty-two".