6445043930 has 32 divisors (see below), whose sum is σ = 12558251664. Its totient is φ = 2367369216.

The previous prime is 6445043881. The next prime is 6445043951. The reversal of 6445043930 is 393405446.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 2797246321 + 3647797609 = 52889^2 + 60397^2 .

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, 103349 + ... + 153528.

Almost surely, 2^6445043930 is an apocalyptic number.

6445043930 is a deficient number, since it is larger than the sum of its proper divisors (6113207734).

6445043930 is a wasteful number, since it uses less digits than its factorization.

6445043930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257090.

The product of its (nonzero) digits is 155520, while the sum is 38.

The square root of 6445043930 is about 80281.0309475408. The cubic root of 6445043930 is about 1860.9810920408.

The spelling of 6445043930 in words is "six billion, four hundred forty-five million, forty-three thousand, nine hundred thirty".