645303 has 8 divisors (see below), whose sum is σ = 911088. Its totient is φ = 404864.

The previous prime is 645257. The next prime is 645313. The reversal of 645303 is 303546.

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-645303 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 645303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645313) 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, 6276 + ... + 6377.

It is an arithmetic number, because the mean of its divisors is an integer number (113886).

2⁶⁴⁵³⁰³ is an apocalyptic number.

645303 is a deficient number, since it is larger than the sum of its proper divisors (265785).

645303 is a wasteful number, since it uses less digits than its factorization.

645303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12673.

The product of its (nonzero) digits is 1080, while the sum is 21.

The square root of 645303 is about 803.3075376218. The cubic root of 645303 is about 86.4147533534.

Adding to 645303 its reverse (303546), we get a palindrome (948849).

The spelling of 645303 in words is "six hundred forty-five thousand, three hundred three".