644614 has 16 divisors (see below), whose sum is σ = 1028736. Its totient is φ = 302400.

The previous prime is 644599. The next prime is 644617. The reversal of 644614 is 416446.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644617) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2154 + ... + 2434.

It is an arithmetic number, because the mean of its divisors is an integer number (64296).

2⁶⁴⁴⁶¹⁴ is an apocalyptic number.

644614 is a deficient number, since it is larger than the sum of its proper divisors (384122).

644614 is a wasteful number, since it uses less digits than its factorization.

644614 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351.

The product of its digits is 2304, while the sum is 25.

The square root of 644614 is about 802.8785711426. The cubic root of 644614 is about 86.3839869444.

It can be divided in two parts, 64 and 4614, that multiplied together give a triangular number (295296 = T₇₆₈).

The spelling of 644614 in words is "six hundred forty-four thousand, six hundred fourteen".