28572848209 has 4 divisors (see below), whose sum is σ = 30253604004. Its totient is φ = 26892092416.

The previous prime is 28572848203. The next prime is 28572848237. The reversal of 28572848209 is 90284827582.

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 10172739600 + 18400108609 = 100860^2 + 135647^2 .

It is a cyclic number.

It is not a de Polignac number, because 28572848209 - 2²³ = 28564459601 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28572848209.

It is not an unprimeable number, because it can be changed into a prime (28572848203) 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, 840377872 + ... + 840377905.

It is an arithmetic number, because the mean of its divisors is an integer number (7563401001).

Almost surely, 2^28572848209 is an apocalyptic number.

It is an amenable number.

28572848209 is a deficient number, since it is larger than the sum of its proper divisors (1680755795).

28572848209 is a wasteful number, since it uses less digits than its factorization.

28572848209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1680755794.

The product of its (nonzero) digits is 5160960, while the sum is 55.

The spelling of 28572848209 in words is "twenty-eight billion, five hundred seventy-two million, eight hundred forty-eight thousand, two hundred nine".