644414345 has 8 divisors (see below), whose sum is σ = 806918976. Its totient is φ = 493116976.

The previous prime is 644414341. The next prime is 644414347. The reversal of 644414345 is 543414446.

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 644414345 - 2² = 644414341 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (644414341) 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, 2801687 + ... + 2801916.

It is an arithmetic number, because the mean of its divisors is an integer number (100864872).

Almost surely, 2^644414345 is an apocalyptic number.

It is an amenable number.

644414345 is a deficient number, since it is larger than the sum of its proper divisors (162504631).

644414345 is a wasteful number, since it uses less digits than its factorization.

644414345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5603631.

The product of its digits is 92160, while the sum is 35.

The square root of 644414345 is about 25385.3175083551. The cubic root of 644414345 is about 863.7506751049.

It can be divided in two parts, 64441 and 4345, that added together give a palindrome (68786).

The spelling of 644414345 in words is "six hundred forty-four million, four hundred fourteen thousand, three hundred forty-five".