81006 has 16 divisors (see below), whose sum is σ = 169344. Its totient is φ = 25784.

The previous prime is 81001. The next prime is 81013. The reversal of 81006 is 60018.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 156 + ... + 431.

It is an arithmetic number, because the mean of its divisors is an integer number (10584).

2⁸¹⁰⁰⁶ is an apocalyptic number.

81006 is an abundant number, since it is smaller than the sum of its proper divisors (88338).

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 (84672).

81006 is a wasteful number, since it uses less digits than its factorization.

81006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 615.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 81006 is about 284.6155301455. The cubic root of 81006 is about 43.2685554159.

The spelling of 81006 in words is "eighty-one thousand, six".