81059538 has 32 divisors (see below), whose sum is σ = 185602176. Its totient is φ = 23119488.

The previous prime is 81059527. The next prime is 81059551. The reversal of 81059538 is 83595018.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 81059496 and 81059505.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29470 + ... + 32102.

It is an arithmetic number, because the mean of its divisors is an integer number (5800068).

Almost surely, 2^81059538 is an apocalyptic number.

81059538 is an abundant number, since it is smaller than the sum of its proper divisors (104542638).

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

81059538 is a wasteful number, since it uses less digits than its factorization.

81059538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3378.

The product of its (nonzero) digits is 43200, while the sum is 39.

The square root of 81059538 is about 9003.3070590756. The cubic root of 81059538 is about 432.7808558140.

The spelling of 81059538 in words is "eighty-one million, fifty-nine thousand, five hundred thirty-eight".