81238440282 has 32 divisors (see below), whose sum is σ = 162778470912. Its totient is φ = 27029260464.

The previous prime is 81238440259. The next prime is 81238440299. The reversal of 81238440282 is 28204483218.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9412453 + ... + 9421079.

It is an arithmetic number, because the mean of its divisors is an integer number (5086827216).

Almost surely, 2^81238440282 is an apocalyptic number.

81238440282 is an abundant number, since it is smaller than the sum of its proper divisors (81540030630).

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

81238440282 is a wasteful number, since it uses less digits than its factorization.

81238440282 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11362.

The product of its (nonzero) digits is 196608, while the sum is 42.

The spelling of 81238440282 in words is "eighty-one billion, two hundred thirty-eight million, four hundred forty thousand, two hundred eighty-two".