28285769 has 4 divisors (see below), whose sum is σ = 28334544. Its totient is φ = 28236996.

The previous prime is 28285753. The next prime is 28285781. The reversal of 28285769 is 96758282.

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 a cyclic number.

It is not a de Polignac number, because 28285769 - 2⁴ = 28285753 is a prime.

It is a super-2 number, since 2×28285769² = 1600169455842722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28285799) 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, 23507 + ... + 24680.

It is an arithmetic number, because the mean of its divisors is an integer number (7083636).

Almost surely, 2^28285769 is an apocalyptic number.

It is an amenable number.

28285769 is a deficient number, since it is larger than the sum of its proper divisors (48775).

28285769 is an equidigital number, since it uses as much as digits as its factorization.

28285769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48774.

The product of its digits is 483840, while the sum is 47.

The square root of 28285769 is about 5318.4367064016. The cubic root of 28285769 is about 304.6884537108.

The spelling of 28285769 in words is "twenty-eight million, two hundred eighty-five thousand, seven hundred sixty-nine".