28500009385 has 4 divisors (see below), whose sum is σ = 34200011268. Its totient is φ = 22800007504.

The previous prime is 28500009379. The next prime is 28500009451. The reversal of 28500009385 is 58390000582.

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 3370150809 + 25129858576 = 58053^2 + 158524^2 .

It is a cyclic number.

It is not a de Polignac number, because 28500009385 - 2⁵ = 28500009353 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2850000934 + ... + 2850000943.

It is an arithmetic number, because the mean of its divisors is an integer number (8550002817).

Almost surely, 2^28500009385 is an apocalyptic number.

It is an amenable number.

28500009385 is a deficient number, since it is larger than the sum of its proper divisors (5700001883).

28500009385 is an equidigital number, since it uses as much as digits as its factorization.

28500009385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5700001882.

The product of its (nonzero) digits is 86400, while the sum is 40.

The spelling of 28500009385 in words is "twenty-eight billion, five hundred million, nine thousand, three hundred eighty-five".