645363 has 6 divisors (see below), whose sum is σ = 932204. Its totient is φ = 430236.

The previous prime is 645353. The next prime is 645367. The reversal of 645363 is 363546.

It is not a de Polignac number, because 645363 - 2⁴ = 645347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645367) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35845 + ... + 35862.

2⁶⁴⁵³⁶³ is an apocalyptic number.

645363 is a deficient number, since it is larger than the sum of its proper divisors (286841).

645363 is a wasteful number, since it uses less digits than its factorization.

645363 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71713 (or 71710 counting only the distinct ones).

The product of its digits is 6480, while the sum is 27.

The square root of 645363 is about 803.3448823513. The cubic root of 645363 is about 86.4174315395.

It can be divided in two parts, 6 and 45363, that added together give a square (45369 = 213²).

The spelling of 645363 in words is "six hundred forty-five thousand, three hundred sixty-three".