6400000444 has 12 divisors (see below), whose sum is σ = 11202373000. Its totient is φ = 3199322448.

The previous prime is 6400000433. The next prime is 6400000457. The reversal of 6400000444 is 4440000046.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 147894 + ... + 186205.

Almost surely, 2^6400000444 is an apocalyptic number.

It is an amenable number.

6400000444 is a deficient number, since it is larger than the sum of its proper divisors (4802372556).

6400000444 is a wasteful number, since it uses less digits than its factorization.

6400000444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338892 (or 338890 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 6400000444 is about 80000.0027750000. The cubic root of 6400000444 is about 1856.6355763798.

The spelling of 6400000444 in words is "six billion, four hundred million, four hundred forty-four", and thus it is an aban number.