28996289 has 24 divisors (see below), whose sum is σ = 34986600. Its totient is φ = 23950080.

The previous prime is 28996249. The next prime is 28996309. The reversal of 28996289 is 98269982.

It can be written as a sum of positive squares in 4 ways, for example, as 19600 + 28976689 = 140^2 + 5383^2 .

It is not a de Polignac number, because 28996289 - 2¹² = 28992193 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28996289.

It is not an unprimeable number, because it can be changed into a prime (28996229) 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 23 ways as a sum of consecutive naturals, for example, 265967 + ... + 266075.

It is an arithmetic number, because the mean of its divisors is an integer number (1457775).

Almost surely, 2^28996289 is an apocalyptic number.

It is an amenable number.

28996289 is a deficient number, since it is larger than the sum of its proper divisors (5990311).

28996289 is a wasteful number, since it uses less digits than its factorization.

28996289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273 (or 266 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 53.

The square root of 28996289 is about 5384.8202384109. The cubic root of 28996289 is about 307.2185769892.

The spelling of 28996289 in words is "twenty-eight million, nine hundred ninety-six thousand, two hundred eighty-nine".