28608677881 has 27 divisors (see below), whose sum is σ = 33843857103. Its totient is φ = 24112740960.

The previous prime is 28608677849. The next prime is 28608677939. The reversal of 28608677881 is 18877680682.

The square root of 28608677881 is 169141.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 16239679225 + 12368998656 = 127435^2 + 111216^2 .

It is not a de Polignac number, because 28608677881 - 2⁵ = 28608677849 is a prime.

It is a super-3 number, since 3×28608677881³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (28608672881) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 86430886 + ... + 86431216.

It is an arithmetic number, because the mean of its divisors is an integer number (1253476189).

Almost surely, 2^28608677881 is an apocalyptic number.

28608677881 is the 169141-st square number.

28608677881 is the 84571-st centered octagonal number.

It is an amenable number.

28608677881 is a deficient number, since it is larger than the sum of its proper divisors (5235179222).

28608677881 is an frugal number, since it uses more digits than its factorization.

28608677881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 822 (or 411 counting only the distinct ones).

The product of its (nonzero) digits is 14450688, while the sum is 61.

The spelling of 28608677881 in words is "twenty-eight billion, six hundred eight million, six hundred seventy-seven thousand, eight hundred eighty-one".