644152 has 16 divisors (see below), whose sum is σ = 1225440. Its totient is φ = 317376.

The previous prime is 644143. The next prime is 644153. The reversal of 644152 is 251446.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644153) by changing a digit.

644152 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 in 3 ways as a sum of consecutive naturals, for example, 33 + ... + 1135.

It is an arithmetic number, because the mean of its divisors is an integer number (76590).

2⁶⁴⁴¹⁵² is an apocalyptic number.

It is an amenable number.

644152 is a deficient number, since it is larger than the sum of its proper divisors (581288).

644152 is a wasteful number, since it uses less digits than its factorization.

644152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1182 (or 1178 counting only the distinct ones).

The product of its digits is 960, while the sum is 22.

The square root of 644152 is about 802.5908048315. The cubic root of 644152 is about 86.3633446477.

Adding to 644152 its reverse (251446), we get a palindrome (895598).

The spelling of 644152 in words is "six hundred forty-four thousand, one hundred fifty-two".