28686445 has 8 divisors (see below), whose sum is σ = 34895736. Its totient is φ = 22634496.

The previous prime is 28686431. The next prime is 28686473. The reversal of 28686445 is 54468682.

It can be written as a sum of positive squares in 4 ways, for example, as 3143529 + 25542916 = 1773^2 + 5054^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28686445 - 2¹³ = 28678253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38932 + ... + 39661.

It is an arithmetic number, because the mean of its divisors is an integer number (4361967).

Almost surely, 2^28686445 is an apocalyptic number.

It is an amenable number.

28686445 is a deficient number, since it is larger than the sum of its proper divisors (6209291).

28686445 is an equidigital number, since it uses as much as digits as its factorization.

28686445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78671.

The product of its digits is 368640, while the sum is 43.

The square root of 28686445 is about 5355.9728341357. The cubic root of 28686445 is about 306.1203799650.

The spelling of 28686445 in words is "twenty-eight million, six hundred eighty-six thousand, four hundred forty-five".