644348 has 6 divisors (see below), whose sum is σ = 1127616. Its totient is φ = 322172.

The previous prime is 644341. The next prime is 644353. The reversal of 644348 is 843446.

It is a self number, because there is not a number n which added to its sum of digits gives 644348.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644341) by changing a digit.

644348 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80540 + ... + 80547.

It is an arithmetic number, because the mean of its divisors is an integer number (187936).

2⁶⁴⁴³⁴⁸ is an apocalyptic number.

It is an amenable number.

644348 is a deficient number, since it is larger than the sum of its proper divisors (483268).

644348 is a wasteful number, since it uses less digits than its factorization.

644348 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161091 (or 161089 counting only the distinct ones).

The product of its digits is 9216, while the sum is 29.

The square root of 644348 is about 802.7129001081. The cubic root of 644348 is about 86.3721031907.

The spelling of 644348 in words is "six hundred forty-four thousand, three hundred forty-eight".