28100822689 has 3 divisors (see below), whose sum is σ = 28100990323. Its totient is φ = 28100655056.

The previous prime is 28100822669. The next prime is 28100822693. The reversal of 28100822689 is 98622800182.

The square root of 28100822689 is 167633.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 8381025 + 28092441664 = 2895^2 + 167608^2 .

It is not a de Polignac number, because 28100822689 - 2⁵ = 28100822657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28100822669) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 83817 + ... + 251449.

Almost surely, 2^28100822689 is an apocalyptic number.

28100822689 is the 167633-rd square number.

28100822689 is the 83817-th centered octagonal number.

It is an amenable number.

28100822689 is a deficient number, since it is larger than the sum of its proper divisors (167634).

28100822689 is an frugal number, since it uses more digits than its factorization.

28100822689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335266 (or 167633 counting only the distinct ones).

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

The spelling of 28100822689 in words is "twenty-eight billion, one hundred million, eight hundred twenty-two thousand, six hundred eighty-nine".