86578321 has 4 divisors (see below), whose sum is σ = 86602932. Its totient is φ = 86553712.

The previous prime is 86578291. The next prime is 86578339. The reversal of 86578321 is 12387568.

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

It can be written as a sum of positive squares in 2 ways, for example, as 27457600 + 59120721 = 5240^2 + 7689^2 .

It is a cyclic number.

It is not a de Polignac number, because 86578321 - 2⁹ = 86577809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (86578361) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5926 + ... + 14431.

It is an arithmetic number, because the mean of its divisors is an integer number (21650733).

Almost surely, 2^86578321 is an apocalyptic number.

It is an amenable number.

86578321 is a deficient number, since it is larger than the sum of its proper divisors (24611).

86578321 is a wasteful number, since it uses less digits than its factorization.

86578321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24610.

The product of its digits is 80640, while the sum is 40.

The square root of 86578321 is about 9304.7472292373. The cubic root of 86578321 is about 442.3877098115.

The spelling of 86578321 in words is "eighty-six million, five hundred seventy-eight thousand, three hundred twenty-one".