644025343 has 8 divisors (see below), whose sum is σ = 694311408. Its totient is φ = 593845824.

The previous prime is 644025329. The next prime is 644025377. The reversal of 644025343 is 343520446.

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

It is not a de Polignac number, because 644025343 - 2⁹ = 644024831 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644025043) 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, 13846 + ... + 38467.

It is an arithmetic number, because the mean of its divisors is an integer number (86788926).

Almost surely, 2^644025343 is an apocalyptic number.

644025343 is a deficient number, since it is larger than the sum of its proper divisors (50286065).

644025343 is a wasteful number, since it uses less digits than its factorization.

644025343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53273.

The product of its (nonzero) digits is 34560, while the sum is 31.

The square root of 644025343 is about 25377.6544030373. The cubic root of 644025343 is about 863.5768385174.

Adding to 644025343 its reverse (343520446), we get a palindrome (987545789).

The spelling of 644025343 in words is "six hundred forty-four million, twenty-five thousand, three hundred forty-three".