87228105891 has 4 divisors (see below), whose sum is σ = 116304141192. Its totient is φ = 58152070592.

The previous prime is 87228105871. The next prime is 87228105893. The reversal of 87228105891 is 19850182278.

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

It is a cyclic number.

It is not a de Polignac number, because 87228105891 - 2⁵ = 87228105859 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87228105893) 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 3 ways as a sum of consecutive naturals, for example, 14538017646 + ... + 14538017651.

It is an arithmetic number, because the mean of its divisors is an integer number (29076035298).

Almost surely, 2^87228105891 is an apocalyptic number.

87228105891 is a deficient number, since it is larger than the sum of its proper divisors (29076035301).

87228105891 is a wasteful number, since it uses less digits than its factorization.

87228105891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29076035300.

The product of its (nonzero) digits is 645120, while the sum is 51.

The spelling of 87228105891 in words is "eighty-seven billion, two hundred twenty-eight million, one hundred five thousand, eight hundred ninety-one".