644050227 has 8 divisors (see below), whose sum is σ = 866759616. Its totient is φ = 425353832.

The previous prime is 644050213. The next prime is 644050229. The reversal of 644050227 is 722050446.

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

It is a cyclic number.

It is not a de Polignac number, because 644050227 - 2⁸ = 644049971 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 644050194 and 644050203.

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

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1002873 + ... + 1003514.

It is an arithmetic number, because the mean of its divisors is an integer number (108344952).

Almost surely, 2^644050227 is an apocalyptic number.

644050227 is a deficient number, since it is larger than the sum of its proper divisors (222709389).

644050227 is a wasteful number, since it uses less digits than its factorization.

644050227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2006497.

The product of its (nonzero) digits is 13440, while the sum is 30.

The square root of 644050227 is about 25378.1446721387. The cubic root of 644050227 is about 863.5879607346.

The spelling of 644050227 in words is "six hundred forty-four million, fifty thousand, two hundred twenty-seven".