28888717139 has 4 divisors (see below), whose sum is σ = 29236774056. Its totient is φ = 28540660224.

The previous prime is 28888717129. The next prime is 28888717141. The reversal of 28888717139 is 93171788882.

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 28888717139 - 2²⁴ = 28871939923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28888717129) 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, 174028334 + ... + 174028499.

It is an arithmetic number, because the mean of its divisors is an integer number (7309193514).

Almost surely, 2^28888717139 is an apocalyptic number.

28888717139 is a deficient number, since it is larger than the sum of its proper divisors (348056917).

28888717139 is an equidigital number, since it uses as much as digits as its factorization.

28888717139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348056916.

The product of its digits is 10838016, while the sum is 62.

The spelling of 28888717139 in words is "twenty-eight billion, eight hundred eighty-eight million, seven hundred seventeen thousand, one hundred thirty-nine".