644417196 has 24 divisors (see below), whose sum is σ = 1511952624. Its totient is φ = 213618240.

The previous prime is 644417161. The next prime is 644417201. The reversal of 644417196 is 691714446.

It is an unprimeable 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, 146175 + ... + 150518.

It is an arithmetic number, because the mean of its divisors is an integer number (62998026).

Almost surely, 2^644417196 is an apocalyptic number.

It is an amenable number.

644417196 is an abundant number, since it is smaller than the sum of its proper divisors (867535428).

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

644417196 is a wasteful number, since it uses less digits than its factorization.

644417196 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296881 (or 296879 counting only the distinct ones).

The product of its digits is 145152, while the sum is 42.

The square root of 644417196 is about 25385.3736628004. The cubic root of 644417196 is about 863.7519488969.

The spelling of 644417196 in words is "six hundred forty-four million, four hundred seventeen thousand, one hundred ninety-six".