28117557617759 has 4 divisors (see below), whose sum is σ = 28137097270080. Its totient is φ = 28098017965440.

The previous prime is 28117557617749. The next prime is 28117557617777. The reversal of 28117557617759 is 95771675571182.

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

It is a cyclic number.

It is not a de Polignac number, because 28117557617759 - 2³² = 28113262650463 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28117557617692 and 28117557617701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28117557617749) 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, 9769824002 + ... + 9769826879.

It is an arithmetic number, because the mean of its divisors is an integer number (7034274317520).

Almost surely, 2^{28117557617759} is an apocalyptic number.

28117557617759 is a deficient number, since it is larger than the sum of its proper divisors (19539652321).

28117557617759 is a wasteful number, since it uses less digits than its factorization.

28117557617759 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19539652320.

The product of its digits is 259308000, while the sum is 71.

The spelling of 28117557617759 in words is "twenty-eight trillion, one hundred seventeen billion, five hundred fifty-seven million, six hundred seventeen thousand, seven hundred fifty-nine".