28133361 has 12 divisors (see below), whose sum is σ = 40935492. Its totient is φ = 18617856.

The previous prime is 28133353. The next prime is 28133381. The reversal of 28133361 is 16333182.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 24354225 + 3779136 = 4935^2 + 1944^2 .

It is not a de Polignac number, because 28133361 - 2³ = 28133353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28133381) 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, 10176 + ... + 12641.

It is an arithmetic number, because the mean of its divisors is an integer number (3411291).

Almost surely, 2^28133361 is an apocalyptic number.

It is an amenable number.

28133361 is a deficient number, since it is larger than the sum of its proper divisors (12802131).

28133361 is a wasteful number, since it uses less digits than its factorization.

28133361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22960 (or 22957 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 28133361 is about 5304.0890829623. The cubic root of 28133361 is about 304.1402320764.

The spelling of 28133361 in words is "twenty-eight million, one hundred thirty-three thousand, three hundred sixty-one".