86987689 has 4 divisors (see below), whose sum is σ = 87008724. Its totient is φ = 86966656.

The previous prime is 86987669. The next prime is 86987699. The reversal of 86987689 is 98678968.

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 56550400 + 30437289 = 7520^2 + 5517^2 .

It is a cyclic number.

It is not a de Polignac number, because 86987689 - 2¹⁷ = 86856617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (86987639) 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, 2032 + ... + 13345.

It is an arithmetic number, because the mean of its divisors is an integer number (21752181).

Almost surely, 2^86987689 is an apocalyptic number.

It is an amenable number.

86987689 is a deficient number, since it is larger than the sum of its proper divisors (21035).

86987689 is a wasteful number, since it uses less digits than its factorization.

86987689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21034.

The product of its digits is 10450944, while the sum is 61.

The square root of 86987689 is about 9326.7190908701. The cubic root of 86987689 is about 443.0838605600.

The spelling of 86987689 in words is "eighty-six million, nine hundred eighty-seven thousand, six hundred eighty-nine".