28360566557 has 4 divisors (see below), whose sum is σ = 30028835196. Its totient is φ = 26692297920.

The previous prime is 28360566551. The next prime is 28360566569. The reversal of 28360566557 is 75566506382.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75566506382 = 2 ⋅37783253191.

It can be written as a sum of positive squares in 2 ways, for example, as 16694190436 + 11666376121 = 129206^2 + 108011^2 .

It is a cyclic number.

It is not a de Polignac number, because 28360566557 - 2⁴ = 28360566541 is a prime.

It is a super-3 number, since 3×28360566557³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28360566499 and 28360566508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28360566551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 834134294 + ... + 834134327.

It is an arithmetic number, because the mean of its divisors is an integer number (7507208799).

Almost surely, 2^28360566557 is an apocalyptic number.

It is an amenable number.

28360566557 is a deficient number, since it is larger than the sum of its proper divisors (1668268639).

28360566557 is a wasteful number, since it uses less digits than its factorization.

28360566557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1668268638.

The product of its (nonzero) digits is 9072000, while the sum is 53.

The spelling of 28360566557 in words is "twenty-eight billion, three hundred sixty million, five hundred sixty-six thousand, five hundred fifty-seven".