28545907208569 has 27 divisors (see below), whose sum is σ = 29528235067527. Its totient is φ = 27595710362304.

The previous prime is 28545907208479. The next prime is 28545907208603. The reversal of 28545907208569 is 96580270954582.

The square root of 28545907208569 is 5342837.

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

It can be written as a sum of positive squares in 13 ways, for example, as 18887411781225 + 9658495427344 = 4345965^2 + 3107812^2 .

It is not a de Polignac number, because 28545907208569 - 2¹⁷ = 28545907077497 is a prime.

It is a super-2 number, since 2×28545907208569² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28545907208498 and 28545907208507.

It is not an unprimeable number, because it can be changed into a prime (28545907208669) 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, 38943938527 + ... + 38943939259.

Almost surely, 2^{28545907208569} is an apocalyptic number.

28545907208569 is the 5342837-th square number.

28545907208569 is the 2671419-th centered octagonal number.

It is an amenable number.

28545907208569 is a deficient number, since it is larger than the sum of its proper divisors (982327858958).

28545907208569 is an frugal number, since it uses more digits than its factorization.

28545907208569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1934 (or 967 counting only the distinct ones).

The product of its (nonzero) digits is 435456000, while the sum is 70.

The spelling of 28545907208569 in words is "twenty-eight trillion, five hundred forty-five billion, nine hundred seven million, two hundred eight thousand, five hundred sixty-nine".