81036 has 18 divisors (see below), whose sum is σ = 204932. Its totient is φ = 27000.

The previous prime is 81031. The next prime is 81041. The reversal of 81036 is 63018.

It is an interprime number because it is at equal distance from previous prime (81031) and next prime (81041).

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (18).

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

It is not an unprimeable number, because it can be changed into a prime (81031) 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, 1090 + ... + 1161.

2⁸¹⁰³⁶ is an apocalyptic number.

It is an amenable number.

81036 is an abundant number, since it is smaller than the sum of its proper divisors (123896).

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

81036 is a wasteful number, since it uses less digits than its factorization.

81036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2261 (or 2256 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 81036 is about 284.6682279426. The cubic root of 81036 is about 43.2738961579.

Subtracting from 81036 its sum of digits (18), we obtain a palindrome (81018).

The spelling of 81036 in words is "eighty-one thousand, thirty-six".