648220 has 12 divisors (see below), whose sum is σ = 1361304. Its totient is φ = 259280.

The previous prime is 648217. The next prime is 648229. The reversal of 648220 is 22846.

648220 = T₃₈ + T₃₉ + ... + T₁₅₇.

It is a junction number, because it is equal to n+sod(n) for n = 648191 and 648200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648229) 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, 16186 + ... + 16225.

It is an arithmetic number, because the mean of its divisors is an integer number (113442).

2⁶⁴⁸²²⁰ is an apocalyptic number.

It is an amenable number.

648220 is an abundant number, since it is smaller than the sum of its proper divisors (713084).

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

648220 is a wasteful number, since it uses less digits than its factorization.

648220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32420 (or 32418 counting only the distinct ones).

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

The square root of 648220 is about 805.1211089023. The cubic root of 648220 is about 86.5447661630.

It can be divided in two parts, 648 and 220, that added together give a palindrome (868).

The spelling of 648220 in words is "six hundred forty-eight thousand, two hundred twenty".