644425363 has 8 divisors (see below), whose sum is σ = 661929408. Its totient is φ = 627153384.

The previous prime is 644425291. The next prime is 644425367. The reversal of 644425363 is 363524446.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-644425363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (644425367) 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, 52381 + ... + 63502.

It is an arithmetic number, because the mean of its divisors is an integer number (82741176).

Almost surely, 2^644425363 is an apocalyptic number.

644425363 is a deficient number, since it is larger than the sum of its proper divisors (17504045).

644425363 is a wasteful number, since it uses less digits than its factorization.

644425363 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116033.

The product of its digits is 207360, while the sum is 37.

The square root of 644425363 is about 25385.5345226371. The cubic root of 644425363 is about 863.7555977920.

The spelling of 644425363 in words is "six hundred forty-four million, four hundred twenty-five thousand, three hundred sixty-three".