28386521289 has 81 divisors (see below), whose sum is σ = 48810247239. Its totient is φ = 15850880640.

The previous prime is 28386521287. The next prime is 28386521389. The reversal of 28386521289 is 98212568382.

It is a happy number.

The square root of 28386521289 is 168483.

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

28386521289 is a `hidden beast` number, since 2 + 8 + 38 + 6 + 521 + 2 + 89 = 666.

It can be written as a sum of positive squares in only one way, i.e., 500193225 + 27886328064 = 22365^2 + 166992^2 .

It is not a de Polignac number, because 28386521289 - 2¹ = 28386521287 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28386521287) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 251208097 + ... + 251208209.

Almost surely, 2^28386521289 is an apocalyptic number.

28386521289 is the 168483-rd square number.

28386521289 is the 84242-nd centered octagonal number.

It is an amenable number.

28386521289 is a deficient number, since it is larger than the sum of its proper divisors (20423725950).

28386521289 is an equidigital number, since it uses as much as digits as its factorization.

28386521289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388 (or 194 counting only the distinct ones).

The product of its digits is 3317760, while the sum is 54.

The spelling of 28386521289 in words is "twenty-eight billion, three hundred eighty-six million, five hundred twenty-one thousand, two hundred eighty-nine".