648018 has 48 divisors (see below), whose sum is σ = 1659840. Its totient is φ = 178848.

The previous prime is 648007. The next prime is 648019. The reversal of 648018 is 810846.

648018 is a `hidden beast` number, since 648 + 0 + 18 = 666.

648018 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 647982 and 648000.

It is not an unprimeable number, because it can be changed into a prime (648019) by changing a digit.

648018 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 23 ways as a sum of consecutive naturals, for example, 4593 + ... + 4731.

It is an arithmetic number, because the mean of its divisors is an integer number (34580).

2⁶⁴⁸⁰¹⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 648018, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (829920).

648018 is an abundant number, since it is smaller than the sum of its proper divisors (1011822).

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

648018 is a wasteful number, since it uses less digits than its factorization.

648018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191 (or 188 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 648018 is about 804.9956521622. The cubic root of 648018 is about 86.5357754608.

The spelling of 648018 in words is "six hundred forty-eight thousand, eighteen".