28205692189 has 4 divisors (see below), whose sum is σ = 29432026656. Its totient is φ = 26979357724.

The previous prime is 28205692157. The next prime is 28205692201. The reversal of 28205692189 is 98129650282.

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 28205692189 - 2⁵ = 28205692157 is a prime.

It is a super-2 number, since 2×28205692189² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28205692289) 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, 613167199 + ... + 613167244.

It is an arithmetic number, because the mean of its divisors is an integer number (7358006664).

Almost surely, 2^28205692189 is an apocalyptic number.

It is an amenable number.

28205692189 is a deficient number, since it is larger than the sum of its proper divisors (1226334467).

28205692189 is a wasteful number, since it uses less digits than its factorization.

28205692189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1226334466.

The product of its (nonzero) digits is 1244160, while the sum is 52.

The spelling of 28205692189 in words is "twenty-eight billion, two hundred five million, six hundred ninety-two thousand, one hundred eighty-nine".