28579717 has 4 divisors (see below), whose sum is σ = 28671340. Its totient is φ = 28488096.

The previous prime is 28579709. The next prime is 28579723. The reversal of 28579717 is 71797582.

It is a Cunningham number, because it is equal to 5346²+1.

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 181476 + 28398241 = 426^2 + 5329^2 .

It is a cyclic number.

It is not a de Polignac number, because 28579717 - 2³ = 28579709 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 (28579757) 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, 45342 + ... + 45967.

It is an arithmetic number, because the mean of its divisors is an integer number (7167835).

Almost surely, 2^28579717 is an apocalyptic number.

It is an amenable number.

28579717 is a deficient number, since it is larger than the sum of its proper divisors (91623).

28579717 is an equidigital number, since it uses as much as digits as its factorization.

28579717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91622.

The product of its digits is 246960, while the sum is 46.

The square root of 28579717 is about 5346.0000935279. Note that the first 4 decimals coincide. The cubic root of 28579717 is about 305.7402675908.

The spelling of 28579717 in words is "twenty-eight million, five hundred seventy-nine thousand, seven hundred seventeen".