81465582 has 64 divisors (see below), whose sum is σ = 189941760. Its totient is φ = 23049600.

The previous prime is 81465577. The next prime is 81465589. The reversal of 81465582 is 28556418.

It is a self number, because there is not a number n which added to its sum of digits gives 81465582.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81465589) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 58648 + ... + 60020.

It is an arithmetic number, because the mean of its divisors is an integer number (2967840).

Almost surely, 2^81465582 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81465582, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94970880).

81465582 is an abundant number, since it is smaller than the sum of its proper divisors (108476178).

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

81465582 is a wasteful number, since it uses less digits than its factorization.

81465582 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1449.

The product of its digits is 76800, while the sum is 39.

The square root of 81465582 is about 9025.8286046213. The cubic root of 81465582 is about 433.5022821818.

The spelling of 81465582 in words is "eighty-one million, four hundred sixty-five thousand, five hundred eighty-two".