644123414 has 48 divisors (see below), whose sum is σ = 1090227600. Its totient is φ = 285109440.

The previous prime is 644123393. The next prime is 644123423. The reversal of 644123414 is 414321446.

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 23 ways as a sum of consecutive naturals, for example, 2812652 + ... + 2812880.

It is an arithmetic number, because the mean of its divisors is an integer number (22713075).

Almost surely, 2^644123414 is an apocalyptic number.

644123414 is a deficient number, since it is larger than the sum of its proper divisors (446104186).

644123414 is a wasteful number, since it uses less digits than its factorization.

644123414 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 509 (or 498 counting only the distinct ones).

The product of its digits is 9216, while the sum is 29.

The square root of 644123414 is about 25379.5865608563. The cubic root of 644123414 is about 863.6206709258.

The spelling of 644123414 in words is "six hundred forty-four million, one hundred twenty-three thousand, four hundred fourteen".