28748866673 has 4 divisors (see below), whose sum is σ = 28749736308. Its totient is φ = 28747997040.

The previous prime is 28748866669. The next prime is 28748866703. The reversal of 28748866673 is 37666884782.

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 27162995344 + 1585871329 = 164812^2 + 39823^2 .

It is a cyclic number.

It is not a de Polignac number, because 28748866673 - 2² = 28748866669 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28748866603) 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, 383186 + ... + 452027.

It is an arithmetic number, because the mean of its divisors is an integer number (7187434077).

Almost surely, 2^28748866673 is an apocalyptic number.

It is an amenable number.

28748866673 is a deficient number, since it is larger than the sum of its proper divisors (869635).

28748866673 is an equidigital number, since it uses as much as digits as its factorization.

28748866673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 869634.

The product of its digits is 130056192, while the sum is 65.

The spelling of 28748866673 in words is "twenty-eight billion, seven hundred forty-eight million, eight hundred sixty-six thousand, six hundred seventy-three".