28118119681 has 8 divisors (see below), whose sum is σ = 28523779560. Its totient is φ = 27714453888.

The previous prime is 28118119669. The next prime is 28118119693. The reversal of 28118119681 is 18691181182.

It is an interprime number because it is at equal distance from previous prime (28118119669) and next prime (28118119693).

It can be written as a sum of positive squares in 4 ways, for example, as 437479056 + 27680640625 = 20916^2 + 166375^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28118119681 is a prime.

It is a super-2 number, since 2×28118119681² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28118119651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 470106 + ... + 526531.

It is an arithmetic number, because the mean of its divisors is an integer number (3565472445).

Almost surely, 2^28118119681 is an apocalyptic number.

It is an amenable number.

28118119681 is a deficient number, since it is larger than the sum of its proper divisors (405659879).

28118119681 is an equidigital number, since it uses as much as digits as its factorization.

28118119681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 997043.

The product of its digits is 55296, while the sum is 46.

The spelling of 28118119681 in words is "twenty-eight billion, one hundred eighteen million, one hundred nineteen thousand, six hundred eighty-one".