644414226 has 8 divisors (see below), whose sum is σ = 1288828464. Its totient is φ = 214804740.

The previous prime is 644414153. The next prime is 644414263. The reversal of 644414226 is 622414446.

644414226 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

644414226 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53701180 + ... + 53701191.

It is an arithmetic number, because the mean of its divisors is an integer number (161103558).

Almost surely, 2^644414226 is an apocalyptic number.

644414226 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

644414226 is a wasteful number, since it uses less digits than its factorization.

644414226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107402376.

The product of its digits is 36864, while the sum is 33.

The square root of 644414226 is about 25385.3151644804. The cubic root of 644414226 is about 863.7506219370.

The spelling of 644414226 in words is "six hundred forty-four million, four hundred fourteen thousand, two hundred twenty-six".