6620660 has 24 divisors (see below), whose sum is σ = 14035560. Its totient is φ = 2623104.

The previous prime is 6620629. The next prime is 6620681. The reversal of 6620660 is 660266.

It can be written as a sum of positive squares in 4 ways, for example, as 2202256 + 4418404 = 1484^2 + 2102^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 662 + ... + 3698.

It is an arithmetic number, because the mean of its divisors is an integer number (584815).

Almost surely, 2^6620660 is an apocalyptic number.

It is an amenable number.

6620660 is an abundant number, since it is smaller than the sum of its proper divisors (7414900).

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

6620660 is a wasteful number, since it uses less digits than its factorization.

6620660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3155 (or 3153 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 6620660 is about 2573.0643209994. The cubic root of 6620660 is about 187.7732667266.

It can be divided in two parts, 66206 and 60, that added together give a palindrome (66266).

The spelling of 6620660 in words is "six million, six hundred twenty thousand, six hundred sixty".