6440013738 has 24 divisors (see below), whose sum is σ = 13955299488. Its totient is φ = 2146373352.

The previous prime is 6440013737. The next prime is 6440013739. The reversal of 6440013738 is 8373100446.

6440013738 is a `hidden beast` number, since 644 + 0 + 0 + 1 + 3 + 7 + 3 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (6440013737) and next prime (6440013739).

It is not an unprimeable number, because it can be changed into a prime (6440013737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 136995 + ... + 177897.

It is an arithmetic number, because the mean of its divisors is an integer number (581470812).

Almost surely, 2^6440013738 is an apocalyptic number.

6440013738 is an abundant number, since it is smaller than the sum of its proper divisors (7515285750).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6440013738 is a wasteful number, since it uses less digits than its factorization.

6440013738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49658 (or 49655 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The square root of 6440013738 is about 80249.6961863408. The cubic root of 6440013738 is about 1860.4968166439.

The spelling of 6440013738 in words is "six billion, four hundred forty million, thirteen thousand, seven hundred thirty-eight".