28161259777 has 16 divisors (see below), whose sum is σ = 33616703232. Its totient is φ = 23065986240.

The previous prime is 28161259769. The next prime is 28161259801. The reversal of 28161259777 is 77795216182.

It is a cyclic number.

It is not a de Polignac number, because 28161259777 - 2³ = 28161259769 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28161259757) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78723 + ... + 250039.

It is an arithmetic number, because the mean of its divisors is an integer number (2101043952).

Almost surely, 2^28161259777 is an apocalyptic number.

It is an amenable number.

28161259777 is a deficient number, since it is larger than the sum of its proper divisors (5455443455).

28161259777 is a wasteful number, since it uses less digits than its factorization.

28161259777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172368.

The product of its digits is 2963520, while the sum is 55.

The spelling of 28161259777 in words is "twenty-eight billion, one hundred sixty-one million, two hundred fifty-nine thousand, seven hundred seventy-seven".