28642242565 has 8 divisors (see below), whose sum is σ = 34371777528. Its totient is φ = 22913069760.

The previous prime is 28642242529. The next prime is 28642242571. The reversal of 28642242565 is 56524224682.

It can be written as a sum of positive squares in 4 ways, for example, as 7894144801 + 20748097764 = 88849^2 + 144042^2 .

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

It is not a de Polignac number, because 28642242565 - 2²³ = 28633853957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 134155 + ... + 274375.

It is an arithmetic number, because the mean of its divisors is an integer number (4296472191).

Almost surely, 2^28642242565 is an apocalyptic number.

It is an amenable number.

28642242565 is a deficient number, since it is larger than the sum of its proper divisors (5729534963).

28642242565 is a wasteful number, since it uses less digits than its factorization.

28642242565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181079.

The product of its digits is 1843200, while the sum is 46.

The spelling of 28642242565 in words is "twenty-eight billion, six hundred forty-two million, two hundred forty-two thousand, five hundred sixty-five".