81057582 has 12 divisors (see below), whose sum is σ = 175624800. Its totient is φ = 27019188.

The previous prime is 81057577. The next prime is 81057583. The reversal of 81057582 is 28575018.

81057582 is a `hidden beast` number, since 8 + 1 + 0 + 575 + 82 = 666.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81057583) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2251582 + ... + 2251617.

It is an arithmetic number, because the mean of its divisors is an integer number (14635400).

Almost surely, 2^81057582 is an apocalyptic number.

81057582 is an abundant number, since it is smaller than the sum of its proper divisors (94567218).

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

81057582 is a wasteful number, since it uses less digits than its factorization.

81057582 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4503207 (or 4503204 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 36.

The square root of 81057582 is about 9003.1984316686. The cubic root of 81057582 is about 432.7773747259. Note that the first 3 decimals are identical.

The spelling of 81057582 in words is "eighty-one million, fifty-seven thousand, five hundred eighty-two".