81128082 has 32 divisors (see below), whose sum is σ = 186061824. Its totient is φ = 23101200.

The previous prime is 81128077. The next prime is 81128093. The reversal of 81128082 is 28082118.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9957 + ... + 16167.

It is an arithmetic number, because the mean of its divisors is an integer number (5814432).

Almost surely, 2^81128082 is an apocalyptic number.

81128082 is an abundant number, since it is smaller than the sum of its proper divisors (104933742).

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

81128082 is a wasteful number, since it uses less digits than its factorization.

81128082 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6534.

The product of its (nonzero) digits is 2048, while the sum is 30.

The square root of 81128082 is about 9007.1128559600. The cubic root of 81128082 is about 432.9028080407.

The spelling of 81128082 in words is "eighty-one million, one hundred twenty-eight thousand, eighty-two".