82120138 has 8 divisors (see below), whose sum is σ = 123247332. Its totient is φ = 41037696.

The previous prime is 82120127. The next prime is 82120163. The reversal of 82120138 is 83102128.

It can be written as a sum of positive squares in 2 ways, for example, as 77739489 + 4380649 = 8817^2 + 2093^2 .

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 (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6145 + ... + 14212.

Almost surely, 2^82120138 is an apocalyptic number.

82120138 is a deficient number, since it is larger than the sum of its proper divisors (41127194).

82120138 is a wasteful number, since it uses less digits than its factorization.

82120138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22376.

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 82120138 is about 9062.0162215701. The cubic root of 82120138 is about 434.6602146857.

The spelling of 82120138 in words is "eighty-two million, one hundred twenty thousand, one hundred thirty-eight".