28683769 has 4 divisors (see below), whose sum is σ = 29459044. Its totient is φ = 27908496.

The previous prime is 28683751. The next prime is 28683779. The reversal of 28683769 is 96738682.

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 25371369 + 3312400 = 5037^2 + 1820^2 .

It is a cyclic number.

It is not a de Polignac number, because 28683769 - 2⁹ = 28683257 is a prime.

It is a super-2 number, since 2×28683769² = 1645517208090722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28683719) 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, 387582 + ... + 387655.

It is an arithmetic number, because the mean of its divisors is an integer number (7364761).

Almost surely, 2^28683769 is an apocalyptic number.

It is an amenable number.

28683769 is a deficient number, since it is larger than the sum of its proper divisors (775275).

28683769 is an equidigital number, since it uses as much as digits as its factorization.

28683769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 775274.

The product of its digits is 870912, while the sum is 49.

The square root of 28683769 is about 5355.7230137489. The cubic root of 28683769 is about 306.1108609092.

The spelling of 28683769 in words is "twenty-eight million, six hundred eighty-three thousand, seven hundred sixty-nine".