8644021919 has 8 divisors (see below), whose sum is σ = 9312393552. Its totient is φ = 7976142720.

The previous prime is 8644021913. The next prime is 8644021993. The reversal of 8644021919 is 9191204468.

8644021919 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 de Polignac number, because none of the positive numbers 2^k-8644021919 is a prime.

It is a super-2 number, since 2×8644021919² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8644021919.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8644021913) 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, 86234 + ... + 157239.

It is an arithmetic number, because the mean of its divisors is an integer number (1164049194).

Almost surely, 2^8644021919 is an apocalyptic number.

8644021919 is a deficient number, since it is larger than the sum of its proper divisors (668371633).

8644021919 is a wasteful number, since it uses less digits than its factorization.

8644021919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246217.

The product of its (nonzero) digits is 124416, while the sum is 44.

The square root of 8644021919 is about 92973.2322714447. The cubic root of 8644021919 is about 2052.2894840623.

The spelling of 8644021919 in words is "eight billion, six hundred forty-four million, twenty-one thousand, nine hundred nineteen".