28914857771689 has 4 divisors (see below), whose sum is σ = 28914938678160. Its totient is φ = 28914776865220.

The previous prime is 28914857771687. The next prime is 28914857771719. The reversal of 28914857771689 is 98617775841982.

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 28914857771689 - 2¹ = 28914857771687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28914857771687) 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, 39914767 + ... + 40632724.

It is an arithmetic number, because the mean of its divisors is an integer number (7228734669540).

Almost surely, 2^{28914857771689} is an apocalyptic number.

It is an amenable number.

28914857771689 is a deficient number, since it is larger than the sum of its proper divisors (80906471).

28914857771689 is an equidigital number, since it uses as much as digits as its factorization.

28914857771689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80906470.

The product of its digits is 3413975040, while the sum is 82.

The spelling of 28914857771689 in words is "twenty-eight trillion, nine hundred fourteen billion, eight hundred fifty-seven million, seven hundred seventy-one thousand, six hundred eighty-nine".