648240 has 80 divisors (see below), whose sum is σ = 2092128. Its totient is φ = 165888.

The previous prime is 648239. The next prime is 648257. The reversal of 648240 is 42846.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a nialpdrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 648240.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8844 + ... + 8916.

2⁶⁴⁸²⁴⁰ is an apocalyptic number.

648240 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 648240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1046064).

648240 is an abundant number, since it is smaller than the sum of its proper divisors (1443888).

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

648240 is a wasteful number, since it uses less digits than its factorization.

648240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126 (or 120 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 648240 is about 805.1335292981. The cubic root of 648240 is about 86.5456562299.

It can be divided in two parts, 648 and 240, that added together give a palindrome (888).

The spelling of 648240 in words is "six hundred forty-eight thousand, two hundred forty".