6620616 has 80 divisors (see below), whose sum is σ = 19667340. Its totient is φ = 2073600.

The previous prime is 6620611. The next prime is 6620617. The reversal of 6620616 is 6160266.

It can be written as a sum of positive squares in 2 ways, for example, as 5904900 + 715716 = 2430^2 + 846^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 6620616.

It is not an unprimeable number, because it can be changed into a prime (6620611) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 10716 + ... + 11316.

Almost surely, 2^6620616 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 6620616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9833670).

6620616 is an abundant number, since it is smaller than the sum of its proper divisors (13046724).

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

6620616 is a wasteful number, since it uses less digits than its factorization.

6620616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636 (or 623 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 6620616 is about 2573.0557708686. The cubic root of 6620616 is about 187.7728507539.

The spelling of 6620616 in words is "six million, six hundred twenty thousand, six hundred sixteen".