8642563986 has 32 divisors (see below), whose sum is σ = 19767841920. Its totient is φ = 2467627776.

The previous prime is 8642563961. The next prime is 8642564003. The reversal of 8642563986 is 6893652468.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6561 + ... + 131636.

It is an arithmetic number, because the mean of its divisors is an integer number (617745060).

Almost surely, 2^8642563986 is an apocalyptic number.

8642563986 is an abundant number, since it is smaller than the sum of its proper divisors (11125277934).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8642563986 is a wasteful number, since it uses less digits than its factorization.

8642563986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139698.

The product of its digits is 14929920, while the sum is 57.

The square root of 8642563986 is about 92965.3913346252. The cubic root of 8642563986 is about 2052.1740953066.

The spelling of 8642563986 in words is "eight billion, six hundred forty-two million, five hundred sixty-three thousand, nine hundred eighty-six".