28191128554367 has 4 divisors (see below), whose sum is σ = 28191155808816. Its totient is φ = 28191101299920.

The previous prime is 28191128554327. The next prime is 28191128554417. The reversal of 28191128554367 is 76345582119182.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28191128554367 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 (28191128554327) 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, 12011843 + ... + 14165684.

It is an arithmetic number, because the mean of its divisors is an integer number (7047788952204).

Almost surely, 2^{28191128554367} is an apocalyptic number.

28191128554367 is a deficient number, since it is larger than the sum of its proper divisors (27254449).

28191128554367 is a wasteful number, since it uses less digits than its factorization.

28191128554367 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27254448.

The product of its digits is 29030400, while the sum is 62.

The spelling of 28191128554367 in words is "twenty-eight trillion, one hundred ninety-one billion, one hundred twenty-eight million, five hundred fifty-four thousand, three hundred sixty-seven".