81070 has 24 divisors (see below), whose sum is σ = 162792. Its totient is φ = 29040.

The previous prime is 81049. The next prime is 81071. The reversal of 81070 is 7018.

It is an Ulam number.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81071) by changing a digit.

81070 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1177 + ... + 1243.

It is an arithmetic number, because the mean of its divisors is an integer number (6783).

2⁸¹⁰⁷⁰ is an apocalyptic number.

81070 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.

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81396).

81070 is a wasteful number, since it uses less digits than its factorization.

81070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96 (or 85 counting only the distinct ones).

The product of its (nonzero) digits is 56, while the sum is 16.

The square root of 81070 is about 284.7279403220. The cubic root of 81070 is about 43.2799474057.

Adding to 81070 its reverse (7018), we get a palindrome (88088).

The spelling of 81070 in words is "eighty-one thousand, seventy".