644214 has 16 divisors (see below), whose sum is σ = 1356480. Its totient is φ = 203400.

The previous prime is 644201. The next prime is 644227. The reversal of 644214 is 412446.

It is an interprime number because it is at equal distance from previous prime (644201) and next prime (644227).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

644214 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2712 + ... + 2939.

It is an arithmetic number, because the mean of its divisors is an integer number (84780).

2⁶⁴⁴²¹⁴ is an apocalyptic number.

644214 is an abundant number, since it is smaller than the sum of its proper divisors (712266).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

644214 is a wasteful number, since it uses less digits than its factorization.

644214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5675.

The product of its digits is 768, while the sum is 21.

The square root of 644214 is about 802.6294288151. The cubic root of 644214 is about 86.3661153993.

It can be divided in two parts, 644 and 214, that added together give a palindrome (858).

The spelling of 644214 in words is "six hundred forty-four thousand, two hundred fourteen".