28928045565 has 24 divisors (see below), whose sum is σ = 51999056928. Its totient is φ = 15428290320.

The previous prime is 28928045561. The next prime is 28928045603. The reversal of 28928045565 is 56554082982.

28928045565 is a `hidden beast` number, since 2 + 8 + 9 + 2 + 80 + 4 + 556 + 5 = 666.

It is not a de Polignac number, because 28928045565 - 2² = 28928045561 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28928045561) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11903331 + ... + 11905760.

It is an arithmetic number, because the mean of its divisors is an integer number (2166627372).

Almost surely, 2^28928045565 is an apocalyptic number.

It is an amenable number.

28928045565 is a deficient number, since it is larger than the sum of its proper divisors (23071011363).

28928045565 is an equidigital number, since it uses as much as digits as its factorization.

28928045565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23809111 (or 23809099 counting only the distinct ones).

The product of its (nonzero) digits is 6912000, while the sum is 54.

The spelling of 28928045565 in words is "twenty-eight billion, nine hundred twenty-eight million, forty-five thousand, five hundred sixty-five".