81005282 has 8 divisors (see below), whose sum is σ = 122760876. Its totient is φ = 40084992.

The previous prime is 81005279. The next prime is 81005311. The reversal of 81005282 is 28250018.

It can be written as a sum of positive squares in 2 ways, for example, as 80658361 + 346921 = 8981^2 + 589^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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 3 ways as a sum of consecutive naturals, for example, 208583 + ... + 208970.

Almost surely, 2^81005282 is an apocalyptic number.

81005282 is a deficient number, since it is larger than the sum of its proper divisors (41755594).

81005282 is a wasteful number, since it uses less digits than its factorization.

81005282 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417652.

The product of its (nonzero) digits is 1280, while the sum is 26.

The square root of 81005282 is about 9000.2934396607. The cubic root of 81005282 is about 432.6842757794.

The spelling of 81005282 in words is "eighty-one million, five thousand, two hundred eighty-two".