644414227 has 8 divisors (see below), whose sum is σ = 670545216. Its totient is φ = 618800832.

The previous prime is 644414153. The next prime is 644414263. The reversal of 644414227 is 722414446.

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 644414227 - 2¹¹ = 644412179 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 644414192 and 644414201.

It is not an unprimeable number, because it can be changed into a prime (644414527) 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, 126858 + ... + 131839.

It is an arithmetic number, because the mean of its divisors is an integer number (83818152).

Almost surely, 2^644414227 is an apocalyptic number.

644414227 is a deficient number, since it is larger than the sum of its proper divisors (26130989).

644414227 is a wasteful number, since it uses less digits than its factorization.

644414227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258797.

The product of its digits is 43008, while the sum is 34.

The square root of 644414227 is about 25385.3151841769. The cubic root of 644414227 is about 863.7506223838.

The spelling of 644414227 in words is "six hundred forty-four million, four hundred fourteen thousand, two hundred twenty-seven".