28693759288891 has 4 divisors (see below), whose sum is σ = 29683199264400. Its totient is φ = 27704319313384.

The previous prime is 28693759288813. The next prime is 28693759288951. The reversal of 28693759288891 is 19888295739682.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28693759288891 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28693759288799 and 28693759288808.

It is not an unprimeable number, because it can be changed into a prime (28693259288891) 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, 494719987711 + ... + 494719987768.

It is an arithmetic number, because the mean of its divisors is an integer number (7420799816100).

Almost surely, 2^{28693759288891} is an apocalyptic number.

28693759288891 is a deficient number, since it is larger than the sum of its proper divisors (989439975509).

28693759288891 is an equidigital number, since it uses as much as digits as its factorization.

28693759288891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 989439975508.

The product of its digits is 7524679680, while the sum is 85.

The spelling of 28693759288891 in words is "twenty-eight trillion, six hundred ninety-three billion, seven hundred fifty-nine million, two hundred eighty-eight thousand, eight hundred ninety-one".