644351343 has 8 divisors (see below), whose sum is σ = 863497008. Its totient is φ = 427386624.

The previous prime is 644351317. The next prime is 644351401. The reversal of 644351343 is 343153446.

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

It is not a de Polignac number, because 644351343 - 2¹³ = 644343151 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644351303) 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, 544546 + ... + 545727.

It is an arithmetic number, because the mean of its divisors is an integer number (107937126).

Almost surely, 2^644351343 is an apocalyptic number.

644351343 is a deficient number, since it is larger than the sum of its proper divisors (219145665).

644351343 is a wasteful number, since it uses less digits than its factorization.

644351343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1090473.

The product of its digits is 51840, while the sum is 33.

The square root of 644351343 is about 25384.0765638618. The cubic root of 644351343 is about 863.7225256210.

The spelling of 644351343 in words is "six hundred forty-four million, three hundred fifty-one thousand, three hundred forty-three".