28448660791 has 4 divisors (see below), whose sum is σ = 28449282784. Its totient is φ = 28448038800.

The previous prime is 28448660783. The next prime is 28448660813. The reversal of 28448660791 is 19706684482.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 28448660791 - 2³ = 28448660783 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28448663791) 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, 236430 + ... + 335851.

It is an arithmetic number, because the mean of its divisors is an integer number (7112320696).

Almost surely, 2^28448660791 is an apocalyptic number.

28448660791 is a deficient number, since it is larger than the sum of its proper divisors (621993).

28448660791 is an equidigital number, since it uses as much as digits as its factorization.

28448660791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621992.

The product of its (nonzero) digits is 4644864, while the sum is 55.

The spelling of 28448660791 in words is "twenty-eight billion, four hundred forty-eight million, six hundred sixty thousand, seven hundred ninety-one".