28549385121 has 4 divisors (see below), whose sum is σ = 38065846832. Its totient is φ = 19032923412.

The previous prime is 28549385119. The next prime is 28549385143. The reversal of 28549385121 is 12158394582.

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 not a de Polignac number, because 28549385121 - 2¹ = 28549385119 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28549386121) 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, 4758230851 + ... + 4758230856.

It is an arithmetic number, because the mean of its divisors is an integer number (9516461708).

Almost surely, 2^28549385121 is an apocalyptic number.

It is an amenable number.

28549385121 is a deficient number, since it is larger than the sum of its proper divisors (9516461711).

28549385121 is an equidigital number, since it uses as much as digits as its factorization.

28549385121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9516461710.

The product of its digits is 691200, while the sum is 48.

The spelling of 28549385121 in words is "twenty-eight billion, five hundred forty-nine million, three hundred eighty-five thousand, one hundred twenty-one".