644196 has 24 divisors (see below), whose sum is σ = 1718080. Its totient is φ = 184032.

The previous prime is 644191. The next prime is 644197. The reversal of 644196 is 691446.

644196 is nontrivially palindromic in base 11.

It is not an unprimeable number, because it can be changed into a prime (644191) by changing a digit.

644196 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 7 ways as a sum of consecutive naturals, for example, 3751 + ... + 3918.

2⁶⁴⁴¹⁹⁶ is an apocalyptic number.

It is an amenable number.

644196 is an abundant number, since it is smaller than the sum of its proper divisors (1073884).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

644196 is a wasteful number, since it uses less digits than its factorization.

644196 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7683 (or 7681 counting only the distinct ones).

The product of its digits is 5184, while the sum is 30.

The square root of 644196 is about 802.6182155919. The cubic root of 644196 is about 86.3653110059.

The spelling of 644196 in words is "six hundred forty-four thousand, one hundred ninety-six".