28505932569 has 27 divisors (see below), whose sum is σ = 41546553087. Its totient is φ = 18834105024.

The previous prime is 28505932561. The next prime is 28505932573. The reversal of 28505932569 is 96523950582.

The square root of 28505932569 is 168837.

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

28505932569 is a `hidden beast` number, since 28 + 5 + 0 + 59 + 3 + 2 + 569 = 666.

It can be written as a sum of positive squares in only one way, i.e., 7686905625 + 20819026944 = 87675^2 + 144288^2 .

It is not a de Polignac number, because 28505932569 - 2³ = 28505932561 is a prime.

It is a super-2 number, since 2×28505932569² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28505932561) 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, 84587169 + ... + 84587505.

Almost surely, 2^28505932569 is an apocalyptic number.

28505932569 is the 168837-th square number.

28505932569 is the 84419-th centered octagonal number.

It is an amenable number.

28505932569 is a deficient number, since it is larger than the sum of its proper divisors (13040620518).

28505932569 is an frugal number, since it uses more digits than its factorization.

28505932569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1014 (or 507 counting only the distinct ones).

The product of its (nonzero) digits is 5832000, while the sum is 54.

The spelling of 28505932569 in words is "twenty-eight billion, five hundred five million, nine hundred thirty-two thousand, five hundred sixty-nine".