28563584881577 has 4 divisors (see below), whose sum is σ = 29548536084420. Its totient is φ = 27578633678736.

The previous prime is 28563584881523. The next prime is 28563584881591. The reversal of 28563584881577 is 77518848536582.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 23798113345561 + 4765471536016 = 4878331^2 + 2182996^2 .

It is a cyclic number.

It is not a de Polignac number, because 28563584881577 - 2²⁸ = 28563316446121 is a prime.

It is a super-2 number, since 2×28563584881577² (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 = 28563584881498 and 28563584881507.

It is not an unprimeable number, because it can be changed into a prime (28563584841577) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 492475601378 + ... + 492475601435.

It is an arithmetic number, because the mean of its divisors is an integer number (7387134021105).

Almost surely, 2^{28563584881577} is an apocalyptic number.

It is an amenable number.

28563584881577 is a deficient number, since it is larger than the sum of its proper divisors (984951202843).

28563584881577 is an equidigital number, since it uses as much as digits as its factorization.

28563584881577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 984951202842.

The product of its digits is 3612672000, while the sum is 77.

The spelling of 28563584881577 in words is "twenty-eight trillion, five hundred sixty-three billion, five hundred eighty-four million, eight hundred eighty-one thousand, five hundred seventy-seven".