645306 has 16 divisors (see below), whose sum is σ = 1302048. Its totient is φ = 213200.

The previous prime is 645257. The next prime is 645313. The reversal of 645306 is 603546.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 376 + ... + 1196.

It is an arithmetic number, because the mean of its divisors is an integer number (81378).

2⁶⁴⁵³⁰⁶ is an apocalyptic number.

645306 is an abundant number, since it is smaller than the sum of its proper divisors (656742).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645306 is a wasteful number, since it uses less digits than its factorization.

645306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 957.

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 645306 is about 803.3094048995. The cubic root of 645306 is about 86.4148872666.

The spelling of 645306 in words is "six hundred forty-five thousand, three hundred six".