28566746289 has 27 divisors (see below), whose sum is σ = 42095917227. Its totient is φ = 18667589616.

The previous prime is 28566746239. The next prime is 28566746309. The reversal of 28566746289 is 98264766582.

The square root of 28566746289 is 169017.

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

28566746289 is a `hidden beast` number, since 2 + 8 + 566 + 7 + 4 + 62 + 8 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 20593685025 + 7973061264 = 143505^2 + 89292^2 .

It is not a de Polignac number, because 28566746289 - 2¹³ = 28566738097 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28566746239) 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, 26873172 + ... + 26874234.

Almost surely, 2^28566746289 is an apocalyptic number.

28566746289 is the 169017-th square number.

28566746289 is the 84509-th centered octagonal number.

It is an amenable number.

28566746289 is a deficient number, since it is larger than the sum of its proper divisors (13529170938).

28566746289 is an frugal number, since it uses more digits than its factorization.

28566746289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2238 (or 1119 counting only the distinct ones).

The product of its digits is 69672960, while the sum is 63.

The spelling of 28566746289 in words is "twenty-eight billion, five hundred sixty-six million, seven hundred forty-six thousand, two hundred eighty-nine".