644114678 has 16 divisors (see below), whose sum is σ = 1009501920. Its totient is φ = 307650816.

The previous prime is 644114659. The next prime is 644114693. The reversal of 644114678 is 876411446.

644114678 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27878 + ... + 45446.

It is an arithmetic number, because the mean of its divisors is an integer number (63093870).

Almost surely, 2^644114678 is an apocalyptic number.

644114678 is a deficient number, since it is larger than the sum of its proper divisors (365387242).

644114678 is a wasteful number, since it uses less digits than its factorization.

644114678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18391.

The product of its digits is 129024, while the sum is 41.

The square root of 644114678 is about 25379.4144534503. The cubic root of 644114678 is about 863.6167665890.

The spelling of 644114678 in words is "six hundred forty-four million, one hundred fourteen thousand, six hundred seventy-eight".