644117422 has 32 divisors (see below), whose sum is σ = 1080180864. Its totient is φ = 286156800.

The previous prime is 644117417. The next prime is 644117447. The reversal of 644117422 is 224711446.

It is a zygodrome in base 3.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70222 + ... + 78862.

It is an arithmetic number, because the mean of its divisors is an integer number (33755652).

Almost surely, 2^644117422 is an apocalyptic number.

644117422 is a deficient number, since it is larger than the sum of its proper divisors (436063442).

644117422 is a wasteful number, since it uses less digits than its factorization.

644117422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8764.

The product of its digits is 10752, while the sum is 31.

The square root of 644117422 is about 25379.4685129535. The cubic root of 644117422 is about 863.6179929550.

Adding to 644117422 its reverse (224711446), we get a palindrome (868828868).

The spelling of 644117422 in words is "six hundred forty-four million, one hundred seventeen thousand, four hundred twenty-two".