28054994161 has 4 divisors (see below), whose sum is σ = 28121633524. Its totient is φ = 27988354800.

The previous prime is 28054994153. The next prime is 28054994167. The reversal of 28054994161 is 16149945082.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 555073600 + 27499920561 = 23560^2 + 165831^2 .

It is a cyclic number.

It is not a de Polignac number, because 28054994161 - 2³ = 28054994153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28054994167) 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, 33319050 + ... + 33319891.

It is an arithmetic number, because the mean of its divisors is an integer number (7030408381).

Almost surely, 2^28054994161 is an apocalyptic number.

It is an amenable number.

28054994161 is a deficient number, since it is larger than the sum of its proper divisors (66639363).

28054994161 is an equidigital number, since it uses as much as digits as its factorization.

28054994161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66639362.

The product of its (nonzero) digits is 622080, while the sum is 49.

The spelling of 28054994161 in words is "twenty-eight billion, fifty-four million, nine hundred ninety-four thousand, one hundred sixty-one".