82128061 has 4 divisors (see below), whose sum is σ = 82854972. Its totient is φ = 81401152.

The previous prime is 82128041. The next prime is 82128077. The reversal of 82128061 is 16082128.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 26327161 + 55800900 = 5131^2 + 7470^2 .

It is a cyclic number.

It is not a de Polignac number, because 82128061 - 2¹¹ = 82126013 is a prime.

It is a Duffinian number.

It is a congruent number.

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

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 363286 + ... + 363511.

It is an arithmetic number, because the mean of its divisors is an integer number (20713743).

Almost surely, 2^82128061 is an apocalyptic number.

It is an amenable number.

82128061 is a deficient number, since it is larger than the sum of its proper divisors (726911).

82128061 is a wasteful number, since it uses less digits than its factorization.

82128061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 726910.

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 82128061 is about 9062.4533653973. The cubic root of 82128061 is about 434.6741929952.

It can be divided in two parts, 821 and 28061, that added together give a palindrome (28882).

The spelling of 82128061 in words is "eighty-two million, one hundred twenty-eight thousand, sixty-one".