644940341 has 8 divisors (see below), whose sum is σ = 651053568. Its totient is φ = 638856000.

The previous prime is 644940323. The next prime is 644940343. The reversal of 644940341 is 143049446.

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

It is a cyclic number.

It is not a de Polignac number, because 644940341 - 2¹⁴ = 644923957 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 (644940343) 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, 39026 + ... + 53036.

It is an arithmetic number, because the mean of its divisors is an integer number (81381696).

Almost surely, 2^644940341 is an apocalyptic number.

It is an amenable number.

644940341 is a deficient number, since it is larger than the sum of its proper divisors (6113227).

644940341 is a wasteful number, since it uses less digits than its factorization.

644940341 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14443.

The product of its (nonzero) digits is 41472, while the sum is 35.

The square root of 644940341 is about 25395.6756358243. The cubic root of 644940341 is about 863.9856201346.

Adding to 644940341 its reverse (143049446), we get a palindrome (787989787).

The spelling of 644940341 in words is "six hundred forty-four million, nine hundred forty thousand, three hundred forty-one".