28723573841 has 4 divisors (see below), whose sum is σ = 28764549684. Its totient is φ = 28682598000.

The previous prime is 28723573789. The next prime is 28723573873. The reversal of 28723573841 is 14837532782.

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 25375215616 + 3348358225 = 159296^2 + 57865^2 .

It is a cyclic number.

It is not a de Polignac number, because 28723573841 - 2³⁰ = 27649832017 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 28723573841.

It is not an unprimeable number, because it can be changed into a prime (28723593841) 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, 20486870 + ... + 20488271.

It is an arithmetic number, because the mean of its divisors is an integer number (7191137421).

Almost surely, 2^28723573841 is an apocalyptic number.

It is an amenable number.

28723573841 is a deficient number, since it is larger than the sum of its proper divisors (40975843).

28723573841 is an equidigital number, since it uses as much as digits as its factorization.

28723573841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40975842.

The product of its digits is 2257920, while the sum is 50.

The spelling of 28723573841 in words is "twenty-eight billion, seven hundred twenty-three million, five hundred seventy-three thousand, eight hundred forty-one".