28809291289 has 3 divisors (see below), whose sum is σ = 28809461023. Its totient is φ = 28809121556.

The previous prime is 28809291283. The next prime is 28809291337. The reversal of 28809291289 is 98219290882.

The square root of 28809291289 is 169733.

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., 1416393225 + 27392898064 = 37635^2 + 165508^2 .

It is not a de Polignac number, because 28809291289 - 2⁵ = 28809291257 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28809291283) 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, 84867 + ... + 254599.

Almost surely, 2^28809291289 is an apocalyptic number.

28809291289 is the 169733-rd square number.

28809291289 is the 84867-th centered octagonal number.

It is an amenable number.

28809291289 is a deficient number, since it is larger than the sum of its proper divisors (169734).

28809291289 is an frugal number, since it uses more digits than its factorization.

28809291289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339466 (or 169733 counting only the distinct ones).

The product of its (nonzero) digits is 2985984, while the sum is 58.

The spelling of 28809291289 in words is "twenty-eight billion, eight hundred nine million, two hundred ninety-one thousand, two hundred eighty-nine".