86791578 has 16 divisors (see below), whose sum is σ = 174246336. Its totient is φ = 28820000.

The previous prime is 86791559. The next prime is 86791589. The reversal of 86791578 is 87519768.

It is a self number, because there is not a number n which added to its sum of digits gives 86791578.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 25923 + ... + 29078.

It is an arithmetic number, because the mean of its divisors is an integer number (10890396).

Almost surely, 2^86791578 is an apocalyptic number.

86791578 is an abundant number, since it is smaller than the sum of its proper divisors (87454758).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

86791578 is a wasteful number, since it uses less digits than its factorization.

86791578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55269.

The product of its digits is 846720, while the sum is 51.

The square root of 86791578 is about 9316.1997617054. The cubic root of 86791578 is about 442.7506371597.

The spelling of 86791578 in words is "eighty-six million, seven hundred ninety-one thousand, five hundred seventy-eight".