28361064278557 has 8 divisors (see below), whose sum is σ = 28469465936856. Its totient is φ = 28252705895232.

The previous prime is 28361064278513. The next prime is 28361064278611. The reversal of 28361064278557 is 75587246016382.

It can be written as a sum of positive squares in 4 ways, for example, as 4843472222521 + 23517592056036 = 2200789^2 + 4849494^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 28361064278557 - 2²⁷ = 28360930060829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28361064278357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9505198 + ... + 12127279.

It is an arithmetic number, because the mean of its divisors is an integer number (3558683242107).

Almost surely, 2^{28361064278557} is an apocalyptic number.

It is an amenable number.

28361064278557 is a deficient number, since it is larger than the sum of its proper divisors (108401658299).

28361064278557 is a wasteful number, since it uses less digits than its factorization.

28361064278557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21637487.

The product of its (nonzero) digits is 135475200, while the sum is 64.

The spelling of 28361064278557 in words is "twenty-eight trillion, three hundred sixty-one billion, sixty-four million, two hundred seventy-eight thousand, five hundred fifty-seven".