28685469 has 4 divisors (see below), whose sum is σ = 38247296. Its totient is φ = 19123644.

The previous prime is 28685467. The next prime is 28685473. The reversal of 28685469 is 96458682.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 28685469 - 2¹ = 28685467 is a prime.

It is a super-2 number, since 2×28685469² = 1645712263499922, 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 (28685467) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4780909 + ... + 4780914.

It is an arithmetic number, because the mean of its divisors is an integer number (9561824).

Almost surely, 2^28685469 is an apocalyptic number.

It is an amenable number.

28685469 is a deficient number, since it is larger than the sum of its proper divisors (9561827).

28685469 is an equidigital number, since it uses as much as digits as its factorization.

28685469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9561826.

The product of its digits is 829440, while the sum is 48.

The square root of 28685469 is about 5355.8817201279. The cubic root of 28685469 is about 306.1169082106.

The spelling of 28685469 in words is "twenty-eight million, six hundred eighty-five thousand, four hundred sixty-nine".