28841136538 has 4 divisors (see below), whose sum is σ = 43261704810. Its totient is φ = 14420568268.

The previous prime is 28841136529. The next prime is 28841136563. The reversal of 28841136538 is 83563114882.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 19384157529 + 9456979009 = 139227^2 + 97247^2 .

It is a super-2 number, since 2×28841136538² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 28841136491 and 28841136500.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 7210284133 + ... + 7210284136.

Almost surely, 2^28841136538 is an apocalyptic number.

28841136538 is a deficient number, since it is larger than the sum of its proper divisors (14420568272).

28841136538 is a wasteful number, since it uses less digits than its factorization.

28841136538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14420568271.

The product of its digits is 1105920, while the sum is 49.

The spelling of 28841136538 in words is "twenty-eight billion, eight hundred forty-one million, one hundred thirty-six thousand, five hundred thirty-eight".