648040 has 32 divisors (see below), whose sum is σ = 1545480. Its totient is φ = 243712.

The previous prime is 648029. The next prime is 648041. The reversal of 648040 is 40846.

648040 = T₃₅₅ + T₃₅₆ + ... + T₃₆₄.

648040 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 568516 + 79524 = 754^2 + 282^2 .

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 648040.

It is not an unprimeable number, because it can be changed into a prime (648041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 204 + ... + 1156.

2⁶⁴⁸⁰⁴⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 648040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (772740).

648040 is an abundant number, since it is smaller than the sum of its proper divisors (897440).

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

648040 is a wasteful number, since it uses less digits than its factorization.

648040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 981 (or 977 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 648040 is about 805.0093167163. The cubic root of 648040 is about 86.5367547368.

Adding to 648040 its reverse (40846), we get a palindrome (688886).

The spelling of 648040 in words is "six hundred forty-eight thousand, forty".