644014 has 16 divisors (see below), whose sum is σ = 1114848. Its totient is φ = 273312.

The previous prime is 644009. The next prime is 644029. The reversal of 644014 is 410446.

It is a junction number, because it is equal to n+sod(n) for n = 643982 and 644000.

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, 2052 + ... + 2344.

It is an arithmetic number, because the mean of its divisors is an integer number (69678).

2⁶⁴⁴⁰¹⁴ is an apocalyptic number.

644014 is a deficient number, since it is larger than the sum of its proper divisors (470834).

644014 is a wasteful number, since it uses less digits than its factorization.

644014 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 459.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 644014 is about 802.5048286459. The cubic root of 644014 is about 86.3571768526.

The spelling of 644014 in words is "six hundred forty-four thousand, fourteen".