644049 has 12 divisors (see below), whose sum is σ = 1063296. Its totient is φ = 367992.

The previous prime is 644047. The next prime is 644051. The reversal of 644049 is 940446.

644049 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (644047) and next prime (644051).

It is not a de Polignac number, because 644049 - 2¹ = 644047 is a prime.

It is a super-2 number, since 2×644049² = 829598228802, which contains 22 as substring.

644049 is strictly pandigital in base 7.

It is a Curzon number.

644049 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (644047) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 5049 + ... + 5174.

It is an arithmetic number, because the mean of its divisors is an integer number (88608).

2⁶⁴⁴⁰⁴⁹ is an apocalyptic number.

It is an amenable number.

644049 is a deficient number, since it is larger than the sum of its proper divisors (419247).

644049 is a wasteful number, since it uses less digits than its factorization.

644049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10236 (or 10233 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 644049 is about 802.5266350720. The cubic root of 644049 is about 86.3587412318.

The spelling of 644049 in words is "six hundred forty-four thousand, forty-nine".