644713017 has 16 divisors (see below), whose sum is σ = 931963200. Its totient is φ = 394080192.

The previous prime is 644712973. The next prime is 644713021. The reversal of 644713017 is 710317446.

644713017 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 644713017 - 2⁶ = 644712953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (644713037) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49663 + ... + 61284.

It is an arithmetic number, because the mean of its divisors is an integer number (58247700).

Almost surely, 2^644713017 is an apocalyptic number.

It is an amenable number.

644713017 is a deficient number, since it is larger than the sum of its proper divisors (287250183).

644713017 is a wasteful number, since it uses less digits than its factorization.

644713017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111112.

The product of its (nonzero) digits is 14112, while the sum is 33.

The square root of 644713017 is about 25391.1995974983. The cubic root of 644713017 is about 863.8840976966.

The spelling of 644713017 in words is "six hundred forty-four million, seven hundred thirteen thousand, seventeen".