28121164 has 12 divisors (see below), whose sum is σ = 50140944. Its totient is φ = 13795184.

The previous prime is 28121161. The next prime is 28121189. The reversal of 28121164 is 46112182.

It is not an unprimeable number, because it can be changed into a prime (28121161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66112 + ... + 66535.

It is an arithmetic number, because the mean of its divisors is an integer number (4178412).

Almost surely, 2^28121164 is an apocalyptic number.

It is an amenable number.

28121164 is a deficient number, since it is larger than the sum of its proper divisors (22019780).

28121164 is a wasteful number, since it uses less digits than its factorization.

28121164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132704 (or 132702 counting only the distinct ones).

The product of its digits is 768, while the sum is 25.

The square root of 28121164 is about 5302.9391850181. The cubic root of 28121164 is about 304.0962731786.

The spelling of 28121164 in words is "twenty-eight million, one hundred twenty-one thousand, one hundred sixty-four".