28202289 has 16 divisors (see below), whose sum is σ = 40089600. Its totient is φ = 17583696.

The previous prime is 28202267. The next prime is 28202299. The reversal of 28202289 is 98220282.

It is not a de Polignac number, because 28202289 - 2⁵ = 28202257 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28202249) 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 15 ways as a sum of consecutive naturals, for example, 1372 + ... + 7634.

It is an arithmetic number, because the mean of its divisors is an integer number (2505600).

Almost surely, 2^28202289 is an apocalyptic number.

It is an amenable number.

28202289 is a deficient number, since it is larger than the sum of its proper divisors (11887311).

28202289 is a wasteful number, since it uses less digits than its factorization.

28202289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6364.

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 28202289 is about 5310.5827363859. The cubic root of 28202289 is about 304.3884152500.

The spelling of 28202289 in words is "twenty-eight million, two hundred two thousand, two hundred eighty-nine".