648020 has 12 divisors (see below), whose sum is σ = 1360884. Its totient is φ = 259200.

The previous prime is 648019. The next prime is 648029. The reversal of 648020 is 20846.

648020 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 2 ways, for example, as 515524 + 132496 = 718^2 + 364^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 32401 = 648020 / (6 + 4 + 8 + 0 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 647983 and 648001.

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 648020.

It is not an unprimeable number, because it can be changed into a prime (648029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16181 + ... + 16220.

It is an arithmetic number, because the mean of its divisors is an integer number (113407).

2⁶⁴⁸⁰²⁰ is an apocalyptic number.

It is an amenable number.

648020 is an abundant number, since it is smaller than the sum of its proper divisors (712864).

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

648020 is a wasteful number, since it uses less digits than its factorization.

648020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32410 (or 32408 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 648020 is about 804.9968944039. The cubic root of 648020 is about 86.5358644868.

Adding to 648020 its reverse (20846), we get a palindrome (668866).

It can be divided in two parts, 6480 and 20, that multiplied together give a square (129600 = 360²).

The spelling of 648020 in words is "six hundred forty-eight thousand, twenty".