8618639644 has 12 divisors (see below), whose sum is σ = 15113593264. Its totient is φ = 4300470144.

The previous prime is 8618639587. The next prime is 8618639681. The reversal of 8618639644 is 4469368168.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2210229 + ... + 2214124.

Almost surely, 2^8618639644 is an apocalyptic number.

It is an amenable number.

8618639644 is a deficient number, since it is larger than the sum of its proper divisors (6494953620).

8618639644 is a wasteful number, since it uses less digits than its factorization.

8618639644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4424844 (or 4424842 counting only the distinct ones).

The product of its digits is 5971968, while the sum is 55.

The square root of 8618639644 is about 92836.6287841173. The cubic root of 8618639644 is about 2050.2787361619.

The spelling of 8618639644 in words is "eight billion, six hundred eighteen million, six hundred thirty-nine thousand, six hundred forty-four".