28865765635857 has 12 divisors (see below), whose sum is σ = 42481692823284. Its totient is φ = 18880752365280.

The previous prime is 28865765635853. The next prime is 28865765635873. The reversal of 28865765635857 is 75853656756882.

28865765635857 is a `hidden beast` number, since 2 + 8 + 8 + 6 + 576 + 5 + 6 + 35 + 8 + 5 + 7 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 13692434708241 + 15173330927616 = 3700329^2 + 3895296^2 .

It is not a de Polignac number, because 28865765635857 - 2² = 28865765635853 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28865765635853) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30257615494 + ... + 30257616447.

It is an arithmetic number, because the mean of its divisors is an integer number (3540141068607).

Almost surely, 2^{28865765635857} is an apocalyptic number.

It is an amenable number.

28865765635857 is a deficient number, since it is larger than the sum of its proper divisors (13615927187427).

28865765635857 is a wasteful number, since it uses less digits than its factorization.

28865765635857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60515232000 (or 60515231997 counting only the distinct ones).

The product of its digits is 20321280000, while the sum is 81.

The spelling of 28865765635857 in words is "twenty-eight trillion, eight hundred sixty-five billion, seven hundred sixty-five million, six hundred thirty-five thousand, eight hundred fifty-seven".