28180885777 has 4 divisors (see below), whose sum is σ = 30742784496. Its totient is φ = 25618987060.

The previous prime is 28180885753. The next prime is 28180885787. The reversal of 28180885777 is 77758808182.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28180885777 - 2²⁷ = 28046668049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28180885727) 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 3 ways as a sum of consecutive naturals, for example, 1280949343 + ... + 1280949364.

It is an arithmetic number, because the mean of its divisors is an integer number (7685696124).

Almost surely, 2^28180885777 is an apocalyptic number.

It is an amenable number.

28180885777 is a deficient number, since it is larger than the sum of its proper divisors (2561898719).

28180885777 is a wasteful number, since it uses less digits than its factorization.

28180885777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2561898718.

The product of its (nonzero) digits is 14049280, while the sum is 61.

The spelling of 28180885777 in words is "twenty-eight billion, one hundred eighty million, eight hundred eighty-five thousand, seven hundred seventy-seven".