86787891 has 12 divisors (see below), whose sum is σ = 125714160. Its totient is φ = 57695280.

The previous prime is 86787859. The next prime is 86787929. The reversal of 86787891 is 19878768.

It is not a de Polignac number, because 86787891 - 2⁵ = 86787859 is a prime.

It is not an unprimeable number, because it can be changed into a prime (86787191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10200 + ... + 16661.

It is an arithmetic number, because the mean of its divisors is an integer number (10476180).

Almost surely, 2^86787891 is an apocalyptic number.

86787891 is a deficient number, since it is larger than the sum of its proper divisors (38926269).

86787891 is a wasteful number, since it uses less digits than its factorization.

86787891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27226 (or 27223 counting only the distinct ones).

The product of its digits is 1354752, while the sum is 54.

The square root of 86787891 is about 9316.0018784884. The cubic root of 86787891 is about 442.7443675624.

It can be divided in two parts, 86787 and 891, that added together give a palindrome (87678).

The spelling of 86787891 in words is "eighty-six million, seven hundred eighty-seven thousand, eight hundred ninety-one".