8644684842 has 24 divisors (see below), whose sum is σ = 18803040516. Its totient is φ = 2870347776.

The previous prime is 8644684823. The next prime is 8644684877. The reversal of 8644684842 is 2484864468.

8644684842 is a `hidden beast` number, since 86 + 446 + 84 + 8 + 42 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 7138391121 + 1506293721 = 84489^2 + 38811^2 .

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 11 ways as a sum of consecutive naturals, for example, 929733 + ... + 938984.

Almost surely, 2^8644684842 is an apocalyptic number.

8644684842 is an abundant number, since it is smaller than the sum of its proper divisors (10158355674).

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

8644684842 is a wasteful number, since it uses less digits than its factorization.

8644684842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1868982 (or 1868979 counting only the distinct ones).

The product of its digits is 9437184, while the sum is 54.

The square root of 8644684842 is about 92976.7973313773. The cubic root of 8644684842 is about 2052.3419471069.

The spelling of 8644684842 in words is "eight billion, six hundred forty-four million, six hundred eighty-four thousand, eight hundred forty-two".