28681174199 has 4 divisors (see below), whose sum is σ = 28949222664. Its totient is φ = 28413125736.

The previous prime is 28681174189. The next prime is 28681174211. The reversal of 28681174199 is 99147118682.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99147118682 = 2 ⋅49573559341.

It is a cyclic number.

It is not a de Polignac number, because 28681174199 - 2⁴ = 28681174183 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28681174189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134024072 + ... + 134024285.

It is an arithmetic number, because the mean of its divisors is an integer number (7237305666).

Almost surely, 2^28681174199 is an apocalyptic number.

28681174199 is a deficient number, since it is larger than the sum of its proper divisors (268048465).

28681174199 is a wasteful number, since it uses less digits than its factorization.

28681174199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268048464.

The product of its digits is 1741824, while the sum is 56.

The spelling of 28681174199 in words is "twenty-eight billion, six hundred eighty-one million, one hundred seventy-four thousand, one hundred ninety-nine".