28328864161 has 4 divisors (see below), whose sum is σ = 30508007572. Its totient is φ = 26149720752.

The previous prime is 28328864159. The next prime is 28328864171. The reversal of 28328864161 is 16146882382.

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 9647168400 + 18681695761 = 98220^2 + 136681^2 .

It is a cyclic number.

It is not a de Polignac number, because 28328864161 - 2¹ = 28328864159 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28328864111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1089571686 + ... + 1089571711.

It is an arithmetic number, because the mean of its divisors is an integer number (7627001893).

Almost surely, 2^28328864161 is an apocalyptic number.

It is an amenable number.

28328864161 is a deficient number, since it is larger than the sum of its proper divisors (2179143411).

28328864161 is a wasteful number, since it uses less digits than its factorization.

28328864161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2179143410.

The product of its digits is 884736, while the sum is 49.

The spelling of 28328864161 in words is "twenty-eight billion, three hundred twenty-eight million, eight hundred sixty-four thousand, one hundred sixty-one".