6444646040 has 64 divisors (see below), whose sum is σ = 16691270400. Its totient is φ = 2193683328.

The previous prime is 6444646007. The next prime is 6444646097. The reversal of 6444646040 is 406464446.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 6444645985 and 6444646003.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 43874 + ... + 121713.

It is an arithmetic number, because the mean of its divisors is an integer number (260801100).

Almost surely, 2^6444646040 is an apocalyptic number.

It is an amenable number.

6444646040 is an abundant number, since it is smaller than the sum of its proper divisors (10246624360).

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

6444646040 is a wasteful number, since it uses less digits than its factorization.

6444646040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165744 (or 165740 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 38.

The square root of 6444646040 is about 80278.5528021028. The cubic root of 6444646040 is about 1860.9427948618.

The spelling of 6444646040 in words is "six billion, four hundred forty-four million, six hundred forty-six thousand, forty".