6648820 has 12 divisors (see below), whose sum is σ = 13962564. Its totient is φ = 2659520.

The previous prime is 6648809. The next prime is 6648823. The reversal of 6648820 is 288466.

It can be written as a sum of positive squares in 2 ways, for example, as 4511376 + 2137444 = 2124^2 + 1462^2 .

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6648823) 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, 166201 + ... + 166240.

It is an arithmetic number, because the mean of its divisors is an integer number (1163547).

Almost surely, 2^6648820 is an apocalyptic number.

It is an amenable number.

6648820 is an abundant number, since it is smaller than the sum of its proper divisors (7313744).

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

6648820 is a wasteful number, since it uses less digits than its factorization.

6648820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332450 (or 332448 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 34.

The square root of 6648820 is about 2578.5305893086. The cubic root of 6648820 is about 188.0391121280.

The spelling of 6648820 in words is "six million, six hundred forty-eight thousand, eight hundred twenty".