28168390161 has 12 divisors (see below), whose sum is σ = 40689738960. Its totient is φ = 18777974040.

The previous prime is 28168390153. The next prime is 28168390183. The reversal of 28168390161 is 16109386182.

It is not a de Polignac number, because 28168390161 - 2³ = 28168390153 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (28168390121) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 139666 + ... + 275396.

It is an arithmetic number, because the mean of its divisors is an integer number (3390811580).

Almost surely, 2^28168390161 is an apocalyptic number.

It is an amenable number.

28168390161 is a deficient number, since it is larger than the sum of its proper divisors (12521348799).

28168390161 is a wasteful number, since it uses less digits than its factorization.

28168390161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158796 (or 158793 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The spelling of 28168390161 in words is "twenty-eight billion, one hundred sixty-eight million, three hundred ninety thousand, one hundred sixty-one".