28033809489 has 135 divisors (see below), whose sum is σ = 50941750587. Its totient is φ = 14851976832.

The previous prime is 28033809437. The next prime is 28033809493. The reversal of 28033809489 is 98490833082.

It is a happy number.

The square root of 28033809489 is 167433.

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

28033809489 is a `hidden beast` number, since 2 + 80 + 3 + 3 + 80 + 9 + 489 = 666.

It can be written as a sum of positive squares in only one way, i.e., 21825630225 + 6208179264 = 147735^2 + 78792^2 .

It is not a de Polignac number, because 28033809489 - 2²¹ = 28031712337 is a prime.

It is a super-2 number, since 2×28033809489² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28033809689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 134 ways as a sum of consecutive naturals, for example, 418415034 + ... + 418415100.

Almost surely, 2^28033809489 is an apocalyptic number.

28033809489 is the 167433-rd square number.

28033809489 is the 83717-th centered octagonal number.

It is an amenable number.

28033809489 is a deficient number, since it is larger than the sum of its proper divisors (22907941098).

28033809489 is an frugal number, since it uses more digits than its factorization.

28033809489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202 (or 94 counting only the distinct ones).

The product of its (nonzero) digits is 2985984, while the sum is 54.

The spelling of 28033809489 in words is "twenty-eight billion, thirty-three million, eight hundred nine thousand, four hundred eighty-nine".