28113816289 has 8 divisors (see below), whose sum is σ = 31320432360. Its totient is φ = 25056345216.

The previous prime is 28113816271. The next prime is 28113816293. The reversal of 28113816289 is 98261831182.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1015059600 + 27098756689 = 31860^2 + 164617^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28113816289 - 2⁷ = 28113816161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28113816259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37285852 + ... + 37286605.

It is an arithmetic number, because the mean of its divisors is an integer number (3915054045).

Almost surely, 2^28113816289 is an apocalyptic number.

28113816289 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

28113816289 is a deficient number, since it is larger than the sum of its proper divisors (3206616071).

28113816289 is a wasteful number, since it uses less digits than its factorization.

28113816289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74572499.

The product of its digits is 331776, while the sum is 49.

The spelling of 28113816289 in words is "twenty-eight billion, one hundred thirteen million, eight hundred sixteen thousand, two hundred eighty-nine".