86784407891 has 4 divisors (see below), whose sum is σ = 86785300800. Its totient is φ = 86783514984.

The previous prime is 86784407887. The next prime is 86784408019. The reversal of 86784407891 is 19870448768.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 86784407891 - 2² = 86784407887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (86784403891) 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, 279971 + ... + 501948.

It is an arithmetic number, because the mean of its divisors is an integer number (21696325200).

Almost surely, 2^86784407891 is an apocalyptic number.

86784407891 is a deficient number, since it is larger than the sum of its proper divisors (892909).

86784407891 is a wasteful number, since it uses less digits than its factorization.

86784407891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 892908.

The product of its (nonzero) digits is 21676032, while the sum is 62.

The spelling of 86784407891 in words is "eighty-six billion, seven hundred eighty-four million, four hundred seven thousand, eight hundred ninety-one".