81071058 has 8 divisors (see below), whose sum is σ = 162142128. Its totient is φ = 27023684.

The previous prime is 81071057. The next prime is 81071071. The reversal of 81071058 is 85017018.

It is a sphenic number, since it is the product of 3 distinct primes.

81071058 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (81071057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6755916 + ... + 6755927.

It is an arithmetic number, because the mean of its divisors is an integer number (20267766).

Almost surely, 2^81071058 is an apocalyptic number.

81071058 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

81071058 is a wasteful number, since it uses less digits than its factorization.

81071058 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13511848.

The product of its (nonzero) digits is 2240, while the sum is 30.

The square root of 81071058 is about 9003.9468012644. The cubic root of 81071058 is about 432.8013567915.

The spelling of 81071058 in words is "eighty-one million, seventy-one thousand, fifty-eight".