28289773 has 4 divisors (see below), whose sum is σ = 28370268. Its totient is φ = 28209280.

The previous prime is 28289753. The next prime is 28289777. The reversal of 28289773 is 37798282.

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 11009124 + 17280649 = 3318^2 + 4157^2 .

It is a cyclic number.

It is not a de Polignac number, because 28289773 - 2¹³ = 28281581 is a prime.

It is a super-2 number, since 2×28289773² = 1600622512783058, 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 (28289777) 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, 39718 + ... + 40423.

It is an arithmetic number, because the mean of its divisors is an integer number (7092567).

Almost surely, 2^28289773 is an apocalyptic number.

It is an amenable number.

28289773 is a deficient number, since it is larger than the sum of its proper divisors (80495).

28289773 is an equidigital number, since it uses as much as digits as its factorization.

28289773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80494.

The product of its digits is 338688, while the sum is 46.

The square root of 28289773 is about 5318.8131194845. The cubic root of 28289773 is about 304.7028297858.

The spelling of 28289773 in words is "twenty-eight million, two hundred eighty-nine thousand, seven hundred seventy-three".