6640444444 has 48 divisors (see below), whose sum is σ = 12538713600. Its totient is φ = 3067203456.

The previous prime is 6640444439. The next prime is 6640444457. The reversal of 6640444444 is 4444440466.

6640444444 is a modest number, since divided by 444444 gives 6640 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 6640444397 and 6640444406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1007592 + ... + 1014160.

It is an arithmetic number, because the mean of its divisors is an integer number (261223200).

Almost surely, 2^6640444444 is an apocalyptic number.

It is an amenable number.

6640444444 is a deficient number, since it is larger than the sum of its proper divisors (5898269156).

6640444444 is a wasteful number, since it uses less digits than its factorization.

6640444444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6922 (or 6920 counting only the distinct ones).

The product of its (nonzero) digits is 589824, while the sum is 40.

The square root of 6640444444 is about 81488.9222164584. The cubic root of 6640444444 is about 1879.6012097398.

The spelling of 6640444444 in words is "six billion, six hundred forty million, four hundred forty-four thousand, four hundred forty-four".