8639642005 has 8 divisors (see below), whose sum is σ = 10370054232. Its totient is φ = 6910057728.

The previous prime is 8639641987. The next prime is 8639642023. The reversal of 8639642005 is 5002469368.

8639642005 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (8639641987) and next prime (8639642023).

It can be written as a sum of positive squares in 4 ways, for example, as 2212573444 + 6427068561 = 47038^2 + 80169^2 .

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 8639642005 - 2⁵ = 8639641973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 183792 + ... + 225961.

It is an arithmetic number, because the mean of its divisors is an integer number (1296256779).

Almost surely, 2^8639642005 is an apocalyptic number.

It is an amenable number.

8639642005 is a deficient number, since it is larger than the sum of its proper divisors (1730412227).

8639642005 is a wasteful number, since it uses less digits than its factorization.

8639642005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 413975.

The product of its (nonzero) digits is 311040, while the sum is 43.

The square root of 8639642005 is about 92949.6745825396. The cubic root of 8639642005 is about 2051.9427947484.

The spelling of 8639642005 in words is "eight billion, six hundred thirty-nine million, six hundred forty-two thousand, five".