28161316 has 24 divisors (see below), whose sum is σ = 52398360. Its totient is φ = 13243136.

The previous prime is 28161313. The next prime is 28161317. The reversal of 28161316 is 61316182.

It can be written as a sum of positive squares in 4 ways, for example, as 9585216 + 18576100 = 3096^2 + 4310^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28161313) 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 7 ways as a sum of consecutive naturals, for example, 18936 + ... + 20368.

It is an arithmetic number, because the mean of its divisors is an integer number (2183265).

Almost surely, 2^28161316 is an apocalyptic number.

It is an amenable number.

28161316 is a deficient number, since it is larger than the sum of its proper divisors (24237044).

28161316 is a wasteful number, since it uses less digits than its factorization.

28161316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1488 (or 1452 counting only the distinct ones).

The product of its digits is 1728, while the sum is 28.

The square root of 28161316 is about 5306.7236596605. The cubic root of 28161316 is about 304.2409360725.

Adding to 28161316 its reverse (61316182), we get a palindrome (89477498).

The spelling of 28161316 in words is "twenty-eight million, one hundred sixty-one thousand, three hundred sixteen".