8640586821 has 8 divisors (see below), whose sum is σ = 12198475584. Its totient is φ = 5421544640.

The previous prime is 8640586811. The next prime is 8640586841. The reversal of 8640586821 is 1286850468.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 8640586821 - 2⁵ = 8640586789 is a prime.

It is a super-2 number, since 2×8640586821² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8640586811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84711585 + ... + 84711686.

It is an arithmetic number, because the mean of its divisors is an integer number (1524809448).

Almost surely, 2^8640586821 is an apocalyptic number.

It is an amenable number.

8640586821 is a deficient number, since it is larger than the sum of its proper divisors (3557888763).

8640586821 is a wasteful number, since it uses less digits than its factorization.

8640586821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169423291.

The product of its (nonzero) digits is 737280, while the sum is 48.

The square root of 8640586821 is about 92954.7568497707. The cubic root of 8640586821 is about 2052.0175909694.

The spelling of 8640586821 in words is "eight billion, six hundred forty million, five hundred eighty-six thousand, eight hundred twenty-one".