28365769 has 6 divisors (see below), whose sum is σ = 28984394. Its totient is φ = 27760080.

The previous prime is 28365731. The next prime is 28365773. The reversal of 28365769 is 96756382.

It can be written as a sum of positive squares in only one way, i.e., 23892544 + 4473225 = 4888^2 + 2115^2 .

It is not a de Polignac number, because 28365769 - 2⁷ = 28365641 is a prime.

It is a super-2 number, since 2×28365769² = 1609233701922722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28365709) 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, 4212 + ... + 8629.

Almost surely, 2^28365769 is an apocalyptic number.

It is an amenable number.

28365769 is a deficient number, since it is larger than the sum of its proper divisors (618625).

28365769 is an equidigital number, since it uses as much as digits as its factorization.

28365769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12935 (or 12888 counting only the distinct ones).

The product of its digits is 544320, while the sum is 46.

The square root of 28365769 is about 5325.9524030919. The cubic root of 28365769 is about 304.9754311482.

The spelling of 28365769 in words is "twenty-eight million, three hundred sixty-five thousand, seven hundred sixty-nine".