8706638821 has 8 divisors (see below), whose sum is σ = 8734302720. Its totient is φ = 8679015408.

The previous prime is 8706638807. The next prime is 8706638833. The reversal of 8706638821 is 1288366078.

8706638821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 8706638821 - 2⁷ = 8706638693 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 (8706638851) by changing a digit.

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, 453795 + ... + 472591.

It is an arithmetic number, because the mean of its divisors is an integer number (1091787840).

Almost surely, 2^8706638821 is an apocalyptic number.

It is an amenable number.

8706638821 is a deficient number, since it is larger than the sum of its proper divisors (27663899).

8706638821 is a wasteful number, since it uses less digits than its factorization.

8706638821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20243.

The product of its (nonzero) digits is 774144, while the sum is 49.

The square root of 8706638821 is about 93309.3715604172. The cubic root of 8706638821 is about 2057.2331299494.

The spelling of 8706638821 in words is "eight billion, seven hundred six million, six hundred thirty-eight thousand, eight hundred twenty-one".