647948311838 has 16 divisors (see below), whose sum is σ = 992154136176. Its totient is φ = 317253643200.

The previous prime is 647948311819. The next prime is 647948311867. The reversal of 647948311838 is 838113849746.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 5788463 + ... + 5899338.

It is an arithmetic number, because the mean of its divisors is an integer number (62009633511).

Almost surely, 2^647948311838 is an apocalyptic number.

647948311838 is a deficient number, since it is larger than the sum of its proper divisors (344205824338).

647948311838 is a wasteful number, since it uses less digits than its factorization.

647948311838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11688379.

The product of its digits is 27869184, while the sum is 62.

The spelling of 647948311838 in words is "six hundred forty-seven billion, nine hundred forty-eight million, three hundred eleven thousand, eight hundred thirty-eight".