81270 has 64 divisors (see below), whose sum is σ = 253440. Its totient is φ = 18144.

The previous prime is 81239. The next prime is 81281. The reversal of 81270 is 7218.

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 a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1869 + ... + 1911.

It is an arithmetic number, because the mean of its divisors is an integer number (3960).

2⁸¹²⁷⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81270, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (126720).

81270 is an abundant number, since it is smaller than the sum of its proper divisors (172170).

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

81270 is a wasteful number, since it uses less digits than its factorization.

81270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66 (or 60 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 18.

The square root of 81270 is about 285.0789364369. The cubic root of 81270 is about 43.3155087769.

Adding to 81270 its reverse (7218), we get a palindrome (88488).

It can be divided in two parts, 81 and 270, that added together give a triangular number (351 = T₂₆).

The spelling of 81270 in words is "eighty-one thousand, two hundred seventy".