4644378819 has 24 divisors (see below), whose sum is σ = 6762927600. Its totient is φ = 3071251008.

The previous prime is 4644378811. The next prime is 4644378821. The reversal of 4644378819 is 9188734464.

It is not a de Polignac number, because 4644378819 - 2³ = 4644378811 is a prime.

It is a super-2 number, since 2×4644378819² = 43140509228751669522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (4644378811) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 611457 + ... + 619005.

It is an arithmetic number, because the mean of its divisors is an integer number (281788650).

Almost surely, 2^4644378819 is an apocalyptic number.

4644378819 is a deficient number, since it is larger than the sum of its proper divisors (2118548781).

4644378819 is a wasteful number, since it uses less digits than its factorization.

4644378819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8099 (or 8096 counting only the distinct ones).

The product of its digits is 4644864, while the sum is 54.

The square root of 4644378819 is about 68149.6795223573. The cubic root of 4644378819 is about 1668.4346931773.

The spelling of 4644378819 in words is "four billion, six hundred forty-four million, three hundred seventy-eight thousand, eight hundred nineteen".