6444436385 has 8 divisors (see below), whose sum is σ = 7750549800. Its totient is φ = 5144065024.

The previous prime is 6444436373. The next prime is 6444436387. The reversal of 6444436385 is 5836344446.

It can be written as a sum of positive squares in 4 ways, for example, as 1128422464 + 5316013921 = 33592^2 + 72911^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6444436385 - 2¹² = 6444432289 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6444436387) 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, 1433042 + ... + 1437531.

It is an arithmetic number, because the mean of its divisors is an integer number (968818725).

Almost surely, 2^6444436385 is an apocalyptic number.

It is an amenable number.

6444436385 is a deficient number, since it is larger than the sum of its proper divisors (1306113415).

6444436385 is a wasteful number, since it uses less digits than its factorization.

6444436385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2871027.

The product of its digits is 3317760, while the sum is 47.

The square root of 6444436385 is about 80277.2469944006. The cubic root of 6444436385 is about 1860.9226147934.

The spelling of 6444436385 in words is "six billion, four hundred forty-four million, four hundred thirty-six thousand, three hundred eighty-five".