28887269 has 6 divisors (see below), whose sum is σ = 29690514. Its totient is φ = 28105200.

The previous prime is 28887253. The next prime is 28887283. The reversal of 28887269 is 96278882.

It can be written as a sum of positive squares in 3 ways, for example, as 12159169 + 16728100 = 3487^2 + 4090^2 .

It is not a de Polignac number, because 28887269 - 2⁴ = 28887253 is a prime.

It is a super-2 number, since 2×28887269² = 1668948620556722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28887169) 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 5 ways as a sum of consecutive naturals, for example, 9182 + ... + 11919.

It is an arithmetic number, because the mean of its divisors is an integer number (4948419).

Almost surely, 2^28887269 is an apocalyptic number.

It is an amenable number.

28887269 is a deficient number, since it is larger than the sum of its proper divisors (803245).

28887269 is an equidigital number, since it uses as much as digits as its factorization.

28887269 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21175 (or 21138 counting only the distinct ones).

The product of its digits is 774144, while the sum is 50.

The square root of 28887269 is about 5374.6878048869. The cubic root of 28887269 is about 306.8330675114.

The spelling of 28887269 in words is "twenty-eight million, eight hundred eighty-seven thousand, two hundred sixty-nine".