644062 has 16 divisors (see below), whose sum is σ = 1077840. Its totient is φ = 286848.

The previous prime is 644057. The next prime is 644089. The reversal of 644062 is 260446.

It is a congruent number.

It is an unprimeable number.

644062 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 (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 148 + ... + 1144.

It is an arithmetic number, because the mean of its divisors is an integer number (67365).

2⁶⁴⁴⁰⁶² is an apocalyptic number.

644062 is a deficient number, since it is larger than the sum of its proper divisors (433778).

644062 is a wasteful number, since it uses less digits than its factorization.

644062 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1035.

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 644062 is about 802.5347344508. The cubic root of 644062 is about 86.3593222725.

The spelling of 644062 in words is "six hundred forty-four thousand, sixty-two".