6440788007 has 2 divisors, whose sum is σ = 6440788008. Its totient is φ = 6440788006.

The previous prime is 6440787989. The next prime is 6440788009. The reversal of 6440788007 is 7008870446.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6440788007 is a prime.

It is a super-2 number, since 2×6440788007² = 82967500302230064098, which contains 22 as substring.

Together with 6440788009, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6440788009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3220394003 + 3220394004.

It is an arithmetic number, because the mean of its divisors is an integer number (3220394004).

Almost surely, 2^6440788007 is an apocalyptic number.

6440788007 is a deficient number, since it is larger than the sum of its proper divisors (1).

6440788007 is an equidigital number, since it uses as much as digits as its factorization.

6440788007 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 301056, while the sum is 44.

The square root of 6440788007 is about 80254.5201655334. The cubic root of 6440788007 is about 1860.5713748329.

The spelling of 6440788007 in words is "six billion, four hundred forty million, seven hundred eighty-eight thousand, seven".