6609820 has 48 divisors (see below), whose sum is σ = 16386048. Its totient is φ = 2191680.

The previous prime is 6609803. The next prime is 6609833. The reversal of 6609820 is 289066.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3579 + ... + 5101.

It is an arithmetic number, because the mean of its divisors is an integer number (341376).

Almost surely, 2^6609820 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 6609820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8193024).

6609820 is an abundant number, since it is smaller than the sum of its proper divisors (9776228).

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

6609820 is a wasteful number, since it uses less digits than its factorization.

6609820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1570 (or 1568 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 6609820 is about 2570.9570202553. The cubic root of 6609820 is about 187.6707304181.

The spelling of 6609820 in words is "six million, six hundred nine thousand, eight hundred twenty".