82021028689 has 4 divisors (see below), whose sum is σ = 82028032240. Its totient is φ = 82014025140.

The previous prime is 82021028659. The next prime is 82021028711. The reversal of 82021028689 is 98682012028.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 82021028689 - 2¹⁵ = 82020995921 is a prime.

It is a super-2 number, since 2×82021028689² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82021028629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3484179 + ... + 3507640.

It is an arithmetic number, because the mean of its divisors is an integer number (20507008060).

Almost surely, 2^82021028689 is an apocalyptic number.

It is an amenable number.

82021028689 is a deficient number, since it is larger than the sum of its proper divisors (7003551).

82021028689 is a wasteful number, since it uses less digits than its factorization.

82021028689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7003550.

The product of its (nonzero) digits is 221184, while the sum is 46.

The spelling of 82021028689 in words is "eighty-two billion, twenty-one million, twenty-eight thousand, six hundred eighty-nine".