644200226 has 8 divisors (see below), whose sum is σ = 973252560. Its totient is φ = 319782708.

The previous prime is 644200223. The next prime is 644200247. The reversal of 644200226 is 622002446.

644200226 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.

It is a junction number, because it is equal to n+sod(n) for n = 644200195 and 644200204.

It is not an unprimeable number, because it can be changed into a prime (644200223) 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, 1158356 + ... + 1158911.

It is an arithmetic number, because the mean of its divisors is an integer number (121656570).

Almost surely, 2^644200226 is an apocalyptic number.

644200226 is a deficient number, since it is larger than the sum of its proper divisors (329052334).

644200226 is a wasteful number, since it uses less digits than its factorization.

644200226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2317408.

The product of its (nonzero) digits is 4608, while the sum is 26.

The square root of 644200226 is about 25381.0997791664. The cubic root of 644200226 is about 863.6549986094.

The spelling of 644200226 in words is "six hundred forty-four million, two hundred thousand, two hundred twenty-six".