28857840065 has 8 divisors (see below), whose sum is σ = 34630421928. Its totient is φ = 23085596160.

The previous prime is 28857840061. The next prime is 28857840083. The reversal of 28857840065 is 56004875882.

It can be written as a sum of positive squares in 4 ways, for example, as 13344639361 + 15513200704 = 115519^2 + 124552^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28857840065 - 2² = 28857840061 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28857839989 and 28857840016.

It is not an unprimeable number, because it can be changed into a prime (28857840061) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 176879 + ... + 298331.

It is an arithmetic number, because the mean of its divisors is an integer number (4328802741).

Almost surely, 2^28857840065 is an apocalyptic number.

It is an amenable number.

28857840065 is a deficient number, since it is larger than the sum of its proper divisors (5772581863).

28857840065 is a wasteful number, since it uses less digits than its factorization.

28857840065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168979.

The product of its (nonzero) digits is 4300800, while the sum is 53.

The spelling of 28857840065 in words is "twenty-eight billion, eight hundred fifty-seven million, eight hundred forty thousand, sixty-five".