28719705893 has 4 divisors (see below), whose sum is σ = 28770718368. Its totient is φ = 28668693420.

The previous prime is 28719705877. The next prime is 28719705901. The reversal of 28719705893 is 39850791782.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28719705893 - 2⁴ = 28719705877 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28719795893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25505393 + ... + 25506518.

It is an arithmetic number, because the mean of its divisors is an integer number (7192679592).

Almost surely, 2^28719705893 is an apocalyptic number.

It is an amenable number.

28719705893 is a deficient number, since it is larger than the sum of its proper divisors (51012475).

28719705893 is an equidigital number, since it uses as much as digits as its factorization.

28719705893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51012474.

The product of its (nonzero) digits is 7620480, while the sum is 59.

The spelling of 28719705893 in words is "twenty-eight billion, seven hundred nineteen million, seven hundred five thousand, eight hundred ninety-three".