28700269 has 4 divisors (see below), whose sum is σ = 30907996. Its totient is φ = 26492544.

The previous prime is 28700257. The next prime is 28700311. The reversal of 28700269 is 96200782.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1295044 + 27405225 = 1138^2 + 5235^2 .

It is not a de Polignac number, because 28700269 - 2¹¹ = 28698221 is a prime.

It is a super-2 number, since 2×28700269² = 1647410881344722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28700209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1103844 + ... + 1103869.

It is an arithmetic number, because the mean of its divisors is an integer number (7726999).

Almost surely, 2^28700269 is an apocalyptic number.

It is an amenable number.

28700269 is a deficient number, since it is larger than the sum of its proper divisors (2207727).

28700269 is a wasteful number, since it uses less digits than its factorization.

28700269 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2207726.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 28700269 is about 5357.2632005531. The cubic root of 28700269 is about 306.1695452130.

The spelling of 28700269 in words is "twenty-eight million, seven hundred thousand, two hundred sixty-nine".