28809718065 has 16 divisors (see below), whose sum is σ = 51217276800. Its totient is φ = 15365182896.

The previous prime is 28809718057. The next prime is 28809718079. The reversal of 28809718065 is 56081790882.

It is not a de Polignac number, because 28809718065 - 2³ = 28809718057 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 106702525 + ... + 106702794.

It is an arithmetic number, because the mean of its divisors is an integer number (3201079800).

Almost surely, 2^28809718065 is an apocalyptic number.

It is an amenable number.

28809718065 is a deficient number, since it is larger than the sum of its proper divisors (22407558735).

28809718065 is a wasteful number, since it uses less digits than its factorization.

28809718065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213405333 (or 213405327 counting only the distinct ones).

The product of its (nonzero) digits is 1935360, while the sum is 54.

The spelling of 28809718065 in words is "twenty-eight billion, eight hundred nine million, seven hundred eighteen thousand, sixty-five".