28298495254689 has 27 divisors (see below), whose sum is σ = 44929661909587. Its totient is φ = 17150496792000.

The previous prime is 28298495254681. The next prime is 28298495254721. The reversal of 28298495254689 is 98645259489282.

It is a happy number.

The square root of 28298495254689 is 5319633.

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

28298495254689 is a `hidden beast` number, since 2 + 8 + 2 + 9 + 8 + 4 + 9 + 525 + 4 + 6 + 89 = 666.

It can be written as a sum of positive squares in only one way, i.e., 28018315592289 + 280179662400 = 5293233^2 + 529320^2 .

It is not a de Polignac number, because 28298495254689 - 2³ = 28298495254681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28298495254681) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 175467289 + ... + 175628489.

Almost surely, 2^{28298495254689} is an apocalyptic number.

28298495254689 is the 5319633-rd square number.

28298495254689 is the 2659817-th centered octagonal number.

It is an amenable number.

28298495254689 is a deficient number, since it is larger than the sum of its proper divisors (16631166654898).

28298495254689 is an frugal number, since it uses more digits than its factorization.

28298495254689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322430 (or 161215 counting only the distinct ones).

The product of its digits is 7166361600, while the sum is 81.

The spelling of 28298495254689 in words is "twenty-eight trillion, two hundred ninety-eight billion, four hundred ninety-five million, two hundred fifty-four thousand, six hundred eighty-nine".