644050223 has 4 divisors (see below), whose sum is σ = 656202168. Its totient is φ = 631898280.

The previous prime is 644050213. The next prime is 644050229. The reversal of 644050223 is 322050446.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 644050223 - 2¹² = 644046127 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 644050192 and 644050201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644050229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6075893 + ... + 6075998.

It is an arithmetic number, because the mean of its divisors is an integer number (164050542).

Almost surely, 2^644050223 is an apocalyptic number.

644050223 is a deficient number, since it is larger than the sum of its proper divisors (12151945).

644050223 is a wasteful number, since it uses less digits than its factorization.

644050223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12151944.

The product of its (nonzero) digits is 5760, while the sum is 26.

The square root of 644050223 is about 25378.1445933307. The cubic root of 644050223 is about 863.5879589468.

The spelling of 644050223 in words is "six hundred forty-four million, fifty thousand, two hundred twenty-three".