81540282 has 8 divisors (see below), whose sum is σ = 163080576. Its totient is φ = 27180092.

The previous prime is 81540271. The next prime is 81540289. The reversal of 81540282 is 28204518.

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

81540282 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (81540289) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6795018 + ... + 6795029.

It is an arithmetic number, because the mean of its divisors is an integer number (20385072).

Almost surely, 2^81540282 is an apocalyptic number.

81540282 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

81540282 is a wasteful number, since it uses less digits than its factorization.

81540282 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13590052.

The product of its (nonzero) digits is 5120, while the sum is 30.

The square root of 81540282 is about 9029.9657806661. The cubic root of 81540282 is about 433.6347419149.

The spelling of 81540282 in words is "eighty-one million, five hundred forty thousand, two hundred eighty-two".