82120842 has 12 divisors (see below), whose sum is σ = 177928530. Its totient is φ = 27373608.

The previous prime is 82120817. The next prime is 82120847. The reversal of 82120842 is 24802128.

It can be written as a sum of positive squares in only one way, i.e., 78694641 + 3426201 = 8871^2 + 1851^2 .

It is not an unprimeable number, because it can be changed into a prime (82120847) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2281117 + ... + 2281152.

Almost surely, 2^82120842 is an apocalyptic number.

82120842 is an abundant number, since it is smaller than the sum of its proper divisors (95807688).

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

82120842 is a wasteful number, since it uses less digits than its factorization.

82120842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4562277 (or 4562274 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 27.

The square root of 82120842 is about 9062.0550649397. The cubic root of 82120842 is about 434.6614567680.

The spelling of 82120842 in words is "eighty-two million, one hundred twenty thousand, eight hundred forty-two".