86665947 has 4 divisors (see below), whose sum is σ = 115554600. Its totient is φ = 57777296.

The previous prime is 86665939. The next prime is 86665961. The reversal of 86665947 is 74956668.

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

It is a cyclic number.

It is not a de Polignac number, because 86665947 - 2³ = 86665939 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 86665947.

It is not an unprimeable number, because it can be changed into a prime (86665927) 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, 14444322 + ... + 14444327.

It is an arithmetic number, because the mean of its divisors is an integer number (28888650).

Almost surely, 2^86665947 is an apocalyptic number.

86665947 is a deficient number, since it is larger than the sum of its proper divisors (28888653).

86665947 is a wasteful number, since it uses less digits than its factorization.

86665947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28888652.

The product of its digits is 2177280, while the sum is 51.

The square root of 86665947 is about 9309.4547101321. The cubic root of 86665947 is about 442.5369064943.

The spelling of 86665947 in words is "eighty-six million, six hundred sixty-five thousand, nine hundred forty-seven".