28288693717 has 4 divisors (see below), whose sum is σ = 29201232256. Its totient is φ = 27376155180.

The previous prime is 28288693691. The next prime is 28288693789. The reversal of 28288693717 is 71739688282.

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 de Polignac number, because none of the positive numbers 2^k-28288693717 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 (28288693417) 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, 456269223 + ... + 456269284.

It is an arithmetic number, because the mean of its divisors is an integer number (7300308064).

Almost surely, 2^28288693717 is an apocalyptic number.

It is an amenable number.

28288693717 is a deficient number, since it is larger than the sum of its proper divisors (912538539).

28288693717 is an equidigital number, since it uses as much as digits as its factorization.

28288693717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 912538538.

The product of its digits is 16257024, while the sum is 61.

The spelling of 28288693717 in words is "twenty-eight billion, two hundred eighty-eight million, six hundred ninety-three thousand, seven hundred seventeen".