81258 has 16 divisors (see below), whose sum is σ = 168480. Its totient is φ = 26096.

The previous prime is 81239. The next prime is 81281. The reversal of 81258 is 85218.

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60 + ... + 407.

It is an arithmetic number, because the mean of its divisors is an integer number (10530).

2⁸¹²⁵⁸ is an apocalyptic number.

81258 is an abundant number, since it is smaller than the sum of its proper divisors (87222).

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 (84240).

81258 is a wasteful number, since it uses less digits than its factorization.

81258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 501.

The product of its digits is 640, while the sum is 24.

The square root of 81258 is about 285.0578888577. The cubic root of 81258 is about 43.3133767410.

The spelling of 81258 in words is "eighty-one thousand, two hundred fifty-eight".