644212414 has 8 divisors (see below), whose sum is σ = 966554928. Its totient is φ = 322027440.

The previous prime is 644212411. The next prime is 644212417. The reversal of 644212414 is 414212446.

It is an interprime number because it is at equal distance from previous prime (644212411) and next prime (644212417).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644212411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28567 + ... + 45874.

It is an arithmetic number, because the mean of its divisors is an integer number (120819366).

Almost surely, 2^644212414 is an apocalyptic number.

644212414 is a deficient number, since it is larger than the sum of its proper divisors (322342514).

644212414 is a wasteful number, since it uses less digits than its factorization.

644212414 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78770.

The product of its digits is 6144, while the sum is 28.

The square root of 644212414 is about 25381.3398779497. The cubic root of 644212414 is about 863.6604452394.

The spelling of 644212414 in words is "six hundred forty-four million, two hundred twelve thousand, four hundred fourteen".