645168 has 20 divisors (see below), whose sum is σ = 1666808. Its totient is φ = 215040.

The previous prime is 645149. The next prime is 645179. The reversal of 645168 is 861546.

It is an unprimeable number.

645168 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 3 ways as a sum of consecutive naturals, for example, 6673 + ... + 6768.

2⁶⁴⁵¹⁶⁸ is an apocalyptic number.

It is an amenable number.

645168 is an abundant number, since it is smaller than the sum of its proper divisors (1021640).

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

645168 is a wasteful number, since it uses less digits than its factorization.

645168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13452 (or 13446 counting only the distinct ones).

The product of its digits is 5760, while the sum is 30.

The square root of 645168 is about 803.2235056321. The cubic root of 645168 is about 86.4087268277.

The spelling of 645168 in words is "six hundred forty-five thousand, one hundred sixty-eight".