86638865 has 8 divisors (see below), whose sum is σ = 104021928. Its totient is φ = 69274240.

The previous prime is 86638859. The next prime is 86638883. The reversal of 86638865 is 56883668.

It is a Cunningham number, because it is equal to 9308²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 1 + 86638864 = 1^2 + 9308^2 .

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

It is not a de Polignac number, because 86638865 - 2⁶ = 86638801 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9875 + ... + 16455.

It is an arithmetic number, because the mean of its divisors is an integer number (13002741).

Almost surely, 2^86638865 is an apocalyptic number.

It is an amenable number.

86638865 is a deficient number, since it is larger than the sum of its proper divisors (17383063).

86638865 is a wasteful number, since it uses less digits than its factorization.

86638865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9219.

The product of its digits is 1658880, while the sum is 50.

The square root of 86638865 is about 9308.0000537172. Note that the first 4 decimals coincide. The cubic root of 86638865 is about 442.4908059843.

The spelling of 86638865 in words is "eighty-six million, six hundred thirty-eight thousand, eight hundred sixty-five".