86987209 has 8 divisors (see below), whose sum is σ = 89952768. Its totient is φ = 84031680.

The previous prime is 86987207. The next prime is 86987213. The reversal of 86987209 is 90278968.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 86987209 - 2¹ = 86987207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (86987207) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17889 + ... + 22225.

It is an arithmetic number, because the mean of its divisors is an integer number (11244096).

Almost surely, 2^86987209 is an apocalyptic number.

It is an amenable number.

86987209 is a deficient number, since it is larger than the sum of its proper divisors (2965559).

86987209 is a wasteful number, since it uses less digits than its factorization.

86987209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5015.

The product of its (nonzero) digits is 435456, while the sum is 49.

The square root of 86987209 is about 9326.6933583130. The cubic root of 86987209 is about 443.0830455763.

The spelling of 86987209 in words is "eighty-six million, nine hundred eighty-seven thousand, two hundred nine".