28989489169 has 3 divisors (see below), whose sum is σ = 28989659433. Its totient is φ = 28989318906.

The previous prime is 28989489167. The next prime is 28989489209. The reversal of 28989489169 is 96198498982.

The square root of 28989489169 is 170263.

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 is not a de Polignac number, because 28989489169 - 2¹ = 28989489167 is a prime.

It is a super-2 number, since 2×28989489169² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28989489167) 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, 85132 + ... + 255394.

It is an arithmetic number, because the mean of its divisors is an integer number (9663219811).

Almost surely, 2^28989489169 is an apocalyptic number.

28989489169 is the 170263-rd square number.

28989489169 is the 85132-nd centered octagonal number.

It is an amenable number.

28989489169 is a deficient number, since it is larger than the sum of its proper divisors (170264).

28989489169 is an frugal number, since it uses more digits than its factorization.

28989489169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340526 (or 170263 counting only the distinct ones).

The product of its digits is 161243136, while the sum is 73.

The spelling of 28989489169 in words is "twenty-eight billion, nine hundred eighty-nine million, four hundred eighty-nine thousand, one hundred sixty-nine".