81585282 has 16 divisors (see below), whose sum is σ = 163259712. Its totient is φ = 27180240.

The previous prime is 81585277. The next prime is 81585289. The reversal of 81585282 is 28258518.

It is a self number, because there is not a number n which added to its sum of digits gives 81585282.

It is not an unprimeable number, because it can be changed into a prime (81585289) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17548 + ... + 21704.

It is an arithmetic number, because the mean of its divisors is an integer number (10203732).

Almost surely, 2^81585282 is an apocalyptic number.

81585282 is an abundant number, since it is smaller than the sum of its proper divisors (81674430).

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

81585282 is a wasteful number, since it uses less digits than its factorization.

81585282 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7433.

The product of its digits is 51200, while the sum is 39.

The square root of 81585282 is about 9032.4571407785. The cubic root of 81585282 is about 433.7144978929.

The spelling of 81585282 in words is "eighty-one million, five hundred eighty-five thousand, two hundred eighty-two".