6449938678 has 16 divisors (see below), whose sum is σ = 9991996416. Its totient is φ = 3119377320.

The previous prime is 6449938667. The next prime is 6449938681. The reversal of 6449938678 is 8768399446.

It is a congruent number.

It is an unprimeable number.

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, 104175 + ... + 154117.

It is an arithmetic number, because the mean of its divisors is an integer number (624499776).

Almost surely, 2^6449938678 is an apocalyptic number.

6449938678 is a deficient number, since it is larger than the sum of its proper divisors (3542057738).

6449938678 is a wasteful number, since it uses less digits than its factorization.

6449938678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52059.

The product of its digits is 62705664, while the sum is 64.

The square root of 6449938678 is about 80311.5102460413. The cubic root of 6449938678 is about 1861.4520859068.

The spelling of 6449938678 in words is "six billion, four hundred forty-nine million, nine hundred thirty-eight thousand, six hundred seventy-eight".