6440705446 has 16 divisors (see below), whose sum is σ = 11096697600. Its totient is φ = 2746430280.

The previous prime is 6440705437. The next prime is 6440705471. The reversal of 6440705446 is 6445070446.

It is a junction number, because it is equal to n+sod(n) for n = 6440705399 and 6440705408.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1153120 + ... + 1158691.

It is an arithmetic number, because the mean of its divisors is an integer number (693543600).

Almost surely, 2^6440705446 is an apocalyptic number.

6440705446 is a deficient number, since it is larger than the sum of its proper divisors (4655992154).

6440705446 is a wasteful number, since it uses less digits than its factorization.

6440705446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2312019.

The product of its (nonzero) digits is 322560, while the sum is 40.

The square root of 6440705446 is about 80254.0057941035. The cubic root of 6440705446 is about 1860.5634249107.

The spelling of 6440705446 in words is "six billion, four hundred forty million, seven hundred five thousand, four hundred forty-six".