81028 has 12 divisors (see below), whose sum is σ = 145152. Its totient is φ = 39560.

The previous prime is 81023. The next prime is 81031. The reversal of 81028 is 82018.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 80996 and 81014.

It is not an unprimeable number, because it can be changed into a prime (81023) by changing a digit.

81028 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28 + ... + 403.

It is an arithmetic number, because the mean of its divisors is an integer number (12096).

2⁸¹⁰²⁸ is an apocalyptic number.

It is an amenable number.

81028 is a deficient number, since it is larger than the sum of its proper divisors (64124).

81028 is a wasteful number, since it uses less digits than its factorization.

81028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 482 (or 480 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

The square root of 81028 is about 284.6541761506. The cubic root of 81028 is about 43.2724720889.

Subtracting 81028 from its reverse (82018), we obtain a triangular number (990 = T₄₄).

It can be divided in two parts, 810 and 28, that added together give a palindrome (838).

The spelling of 81028 in words is "eighty-one thousand, twenty-eight".