28560562689 has 4 divisors (see below), whose sum is σ = 38080750256. Its totient is φ = 19040375124.

The previous prime is 28560562643. The next prime is 28560562691. The reversal of 28560562689 is 98626506582.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 28560562689 - 2²³ = 28552174081 is a prime.

It is a super-2 number, since 2×28560562689² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28560562609) 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, 4760093779 + ... + 4760093784.

It is an arithmetic number, because the mean of its divisors is an integer number (9520187564).

Almost surely, 2^28560562689 is an apocalyptic number.

It is an amenable number.

28560562689 is a deficient number, since it is larger than the sum of its proper divisors (9520187567).

28560562689 is an equidigital number, since it uses as much as digits as its factorization.

28560562689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9520187566.

The product of its (nonzero) digits is 12441600, while the sum is 57.

The spelling of 28560562689 in words is "twenty-eight billion, five hundred sixty million, five hundred sixty-two thousand, six hundred eighty-nine".