6444436387 has 2 divisors, whose sum is σ = 6444436388. Its totient is φ = 6444436386.

The previous prime is 6444436373. The next prime is 6444436403. The reversal of 6444436387 is 7836344446.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6444436387 is a prime.

It is a super-2 number, since 2×6444436387² = 83061520692179227538, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6444436387.

It is not a weakly prime, because it can be changed into another prime (6444436337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3222218193 + 3222218194.

It is an arithmetic number, because the mean of its divisors is an integer number (3222218194).

Almost surely, 2^6444436387 is an apocalyptic number.

6444436387 is a deficient number, since it is larger than the sum of its proper divisors (1).

6444436387 is an equidigital number, since it uses as much as digits as its factorization.

6444436387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4644864, while the sum is 49.

The square root of 6444436387 is about 80277.2470068574. The cubic root of 6444436387 is about 1860.9226149859.

The spelling of 6444436387 in words is "six billion, four hundred forty-four million, four hundred thirty-six thousand, three hundred eighty-seven".