82128081 has 8 divisors (see below), whose sum is σ = 125147584. Its totient is φ = 46930320.

The previous prime is 82128077. The next prime is 82128091. The reversal of 82128081 is 18082128.

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

It is not a de Polignac number, because 82128081 - 2² = 82128077 is a prime.

It is a super-2 number, since 2×82128081² = 13490043377485122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82128031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1955410 + ... + 1955451.

It is an arithmetic number, because the mean of its divisors is an integer number (15643448).

Almost surely, 2^82128081 is an apocalyptic number.

It is an amenable number.

82128081 is a deficient number, since it is larger than the sum of its proper divisors (43019503).

82128081 is a wasteful number, since it uses less digits than its factorization.

82128081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3910871.

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

The square root of 82128081 is about 9062.4544688511. The cubic root of 82128081 is about 434.6742282795.

The spelling of 82128081 in words is "eighty-two million, one hundred twenty-eight thousand, eighty-one".