644149 has 8 divisors (see below), whose sum is σ = 725760. Its totient is φ = 566400.

The previous prime is 644143. The next prime is 644153. The reversal of 644149 is 941446.

644149 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 644149 - 2³ = 644141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644141) 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, 604 + ... + 1285.

It is an arithmetic number, because the mean of its divisors is an integer number (90720).

2⁶⁴⁴¹⁴⁹ is an apocalyptic number.

It is an amenable number.

644149 is a deficient number, since it is larger than the sum of its proper divisors (81611).

644149 is a wasteful number, since it uses less digits than its factorization.

644149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1931.

The product of its digits is 3456, while the sum is 28.

The square root of 644149 is about 802.5889358819. The cubic root of 644149 is about 86.3632105746.

The spelling of 644149 in words is "six hundred forty-four thousand, one hundred forty-nine".