28578539523 has 4 divisors (see below), whose sum is σ = 38104719368. Its totient is φ = 19052359680.

The previous prime is 28578539519. The next prime is 28578539579. The reversal of 28578539523 is 32593587582.

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

It is not a de Polignac number, because 28578539523 - 2² = 28578539519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28578539923) 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, 4763089918 + ... + 4763089923.

It is an arithmetic number, because the mean of its divisors is an integer number (9526179842).

Almost surely, 2^28578539523 is an apocalyptic number.

28578539523 is a deficient number, since it is larger than the sum of its proper divisors (9526179845).

28578539523 is an equidigital number, since it uses as much as digits as its factorization.

28578539523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9526179844.

The product of its digits is 18144000, while the sum is 57.

The spelling of 28578539523 in words is "twenty-eight billion, five hundred seventy-eight million, five hundred thirty-nine thousand, five hundred twenty-three".