644603314 has 16 divisors (see below), whose sum is σ = 1024355808. Its totient is φ = 303172672.

The previous prime is 644603299. The next prime is 644603317. The reversal of 644603314 is 413306446.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (644603317) 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, 72897 + ... + 81259.

It is an arithmetic number, because the mean of its divisors is an integer number (64022238).

Almost surely, 2^644603314 is an apocalyptic number.

644603314 is a deficient number, since it is larger than the sum of its proper divisors (379752494).

644603314 is a wasteful number, since it uses less digits than its factorization.

644603314 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10649.

The product of its (nonzero) digits is 20736, while the sum is 31.

The square root of 644603314 is about 25389.0392492508. The cubic root of 644603314 is about 863.8350960217.

The spelling of 644603314 in words is "six hundred forty-four million, six hundred three thousand, three hundred fourteen".