86643863 has 4 divisors (see below), whose sum is σ = 86810688. Its totient is φ = 86477040.

The previous prime is 86643859. The next prime is 86643877. The reversal of 86643863 is 36834668.

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 86643863 - 2² = 86643859 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86643833) 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, 82631 + ... + 83672.

It is an arithmetic number, because the mean of its divisors is an integer number (21702672).

Almost surely, 2^86643863 is an apocalyptic number.

86643863 is a deficient number, since it is larger than the sum of its proper divisors (166825).

86643863 is a wasteful number, since it uses less digits than its factorization.

86643863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166824.

The product of its digits is 497664, while the sum is 44.

The square root of 86643863 is about 9308.2685285718. The cubic root of 86643863 is about 442.4993145850.

The spelling of 86643863 in words is "eighty-six million, six hundred forty-three thousand, eight hundred sixty-three".