28766559 has 4 divisors (see below), whose sum is σ = 38355416. Its totient is φ = 19177704.

The previous prime is 28766539. The next prime is 28766587. The reversal of 28766559 is 95566782.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 28766559 - 2¹⁷ = 28635487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28766519) 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, 4794424 + ... + 4794429.

It is an arithmetic number, because the mean of its divisors is an integer number (9588854).

Almost surely, 2^28766559 is an apocalyptic number.

28766559 is a deficient number, since it is larger than the sum of its proper divisors (9588857).

28766559 is an equidigital number, since it uses as much as digits as its factorization.

28766559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9588856.

The product of its digits is 907200, while the sum is 48.

The square root of 28766559 is about 5363.4465598158. The cubic root of 28766559 is about 306.4050874079.

The spelling of 28766559 in words is "twenty-eight million, seven hundred sixty-six thousand, five hundred fifty-nine".