6440067338 has 16 divisors (see below), whose sum is σ = 9923311944. Its totient is φ = 3132334080.

The previous prime is 6440067329. The next prime is 6440067391. The reversal of 6440067338 is 8337600446.

It can be written as a sum of positive squares in 4 ways, for example, as 6269947489 + 170119849 = 79183^2 + 13043^2 .

It is a junction number, because it is equal to n+sod(n) for n = 6440067295 and 6440067304.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 682106 + ... + 691482.

Almost surely, 2^6440067338 is an apocalyptic number.

6440067338 is a deficient number, since it is larger than the sum of its proper divisors (3483244606).

6440067338 is a wasteful number, since it uses less digits than its factorization.

6440067338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18697.

The product of its (nonzero) digits is 290304, while the sum is 41.

The square root of 6440067338 is about 80250.0301432965. The cubic root of 6440067338 is about 1860.5019782454.

The spelling of 6440067338 in words is "six billion, four hundred forty million, sixty-seven thousand, three hundred thirty-eight".