645318 has 12 divisors (see below), whose sum is σ = 1398228. Its totient is φ = 215100.

The previous prime is 645313. The next prime is 645329. The reversal of 645318 is 813546.

645318 is a `hidden beast` number, since 645 + 3 + 18 = 666.

645318 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×645318² = 832870642248, which contains 22 as substring.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 645291 and 645300.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 645318.

It is not an unprimeable number, because it can be changed into a prime (645313) by changing a digit.

645318 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17908 + ... + 17943.

It is an arithmetic number, because the mean of its divisors is an integer number (116519).

2⁶⁴⁵³¹⁸ is an apocalyptic number.

645318 is an abundant number, since it is smaller than the sum of its proper divisors (752910).

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

645318 is a wasteful number, since it uses less digits than its factorization.

645318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35859 (or 35856 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 645318 is about 803.3168739669. The cubic root of 645318 is about 86.4154229155.

The spelling of 645318 in words is "six hundred forty-five thousand, three hundred eighteen".