6444645730 has 16 divisors (see below), whose sum is σ = 11790533304. Its totient is φ = 2535598080.

The previous prime is 6444645689. The next prime is 6444645733. The reversal of 6444645730 is 375464446.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2281686289 + 4162959441 = 47767^2 + 64521^2 .

It is not an unprimeable number, because it can be changed into a prime (6444645733) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 5281887 + ... + 5283106.

Almost surely, 2^6444645730 is an apocalyptic number.

6444645730 is a deficient number, since it is larger than the sum of its proper divisors (5345887574).

6444645730 is a wasteful number, since it uses less digits than its factorization.

6444645730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10565061.

The product of its (nonzero) digits is 967680, while the sum is 43.

The square root of 6444645730 is about 80278.5508713255. The cubic root of 6444645730 is about 1860.9427650234.

The spelling of 6444645730 in words is "six billion, four hundred forty-four million, six hundred forty-five thousand, seven hundred thirty".