28523641345 has 4 divisors (see below), whose sum is σ = 34228369620. Its totient is φ = 22818913072.

The previous prime is 28523641303. The next prime is 28523641351. The reversal of 28523641345 is 54314632582.

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 2959468801 + 25564172544 = 54401^2 + 159888^2 .

It is a cyclic number.

It is not a de Polignac number, because 28523641345 - 2¹⁷ = 28523510273 is a prime.

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, 2852364130 + ... + 2852364139.

It is an arithmetic number, because the mean of its divisors is an integer number (8557092405).

Almost surely, 2^28523641345 is an apocalyptic number.

It is an amenable number.

28523641345 is a deficient number, since it is larger than the sum of its proper divisors (5704728275).

28523641345 is an equidigital number, since it uses as much as digits as its factorization.

28523641345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5704728274.

The product of its digits is 691200, while the sum is 43.

The spelling of 28523641345 in words is "twenty-eight billion, five hundred twenty-three million, six hundred forty-one thousand, three hundred forty-five".