28505077559 has 4 divisors (see below), whose sum is σ = 32577231504. Its totient is φ = 24432923616.

The previous prime is 28505077519. The next prime is 28505077567. The reversal of 28505077559 is 95577050582.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28505077559 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28505077559.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28505077519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2036076962 + ... + 2036076975.

It is an arithmetic number, because the mean of its divisors is an integer number (8144307876).

Almost surely, 2^28505077559 is an apocalyptic number.

28505077559 is a deficient number, since it is larger than the sum of its proper divisors (4072153945).

28505077559 is an equidigital number, since it uses as much as digits as its factorization.

28505077559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4072153944.

The product of its (nonzero) digits is 4410000, while the sum is 53.

The spelling of 28505077559 in words is "twenty-eight billion, five hundred five million, seventy-seven thousand, five hundred fifty-nine".