644548214 has 16 divisors (see below), whose sum is σ = 1009789200. Its totient is φ = 308247264.

The previous prime is 644548189. The next prime is 644548231. The reversal of 644548214 is 412845446.

644548214 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, 69449 + ... + 78180.

It is an arithmetic number, because the mean of its divisors is an integer number (63111825).

Almost surely, 2^644548214 is an apocalyptic number.

644548214 is a deficient number, since it is larger than the sum of its proper divisors (365240986).

644548214 is a wasteful number, since it uses less digits than its factorization.

644548214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147727.

The product of its digits is 122880, while the sum is 38.

The square root of 644548214 is about 25387.9541121375. The cubic root of 644548214 is about 863.8104820878.

The spelling of 644548214 in words is "six hundred forty-four million, five hundred forty-eight thousand, two hundred fourteen".